Succulents include some of the most unusual plants in the world, from stone-like Lithops and translucent haworthias to spiral aloes, crested cacti, and plants with swollen stems adapted for storing water. Their remarkable shapes, colors, and survival strategies have made unusual species especially popular with collectors and succulent enthusiasts.

However, a succulent described as “rare” is not necessarily endangered. Some species have naturally limited distributions or threatened wild populations, while others are simply uncommon in cultivation, slow to grow, difficult to propagate, or prized for distinctive traits. Some unusual succulents are even widely cultivated despite being scarce in their natural habitats.

In this guide, you’ll discover 36 rare and unusual succulents, including their botanical names, native ranges, distinctive characteristics, and notable adaptations. You’ll also learn what makes certain succulents rare, how rarity differs from conservation status, and the basic growing and propagation requirements for maintaining these fascinating plants.

Flower Lovers Want to Know

What makes a succulent rare?

A succulent may be considered rare because it has a very limited natural range, a small wild population, specialized habitat requirements, slow growth, or difficulty reproducing. Other succulents are considered rare mainly in cultivation because they are difficult to propagate or are produced by relatively few growers. A plant that is uncommon in nurseries is not necessarily endangered in the wild.

Are rare succulents endangered?

Not necessarily. Some rare succulents are threatened or endangered in their natural habitats, while others have stable wild populations but remain uncommon in cultivation. Conversely, some species that are widely grown by collectors may be threatened in the wild. Conservation status should therefore be considered separately from rarity in the plant trade.

Are all succulents cacti?

No. All cacti are generally considered succulents, but not all succulents are cacti. Cacti belong to the family Cactaceae, while succulent plants occur in many other plant families. Aloes, lithops, haworthias, echeverias, aeoniums, and many euphorbias are succulents but are not cacti.

Why are some rare succulents so expensive?

Price can be influenced by slow growth, difficult propagation, unusual coloration, variegation, mature size, limited nursery production, and collector demand. A high price does not necessarily mean that a plant is rare or endangered in the wild, and prices can change considerably as plants become more widely propagated.

Can you legally buy rare or endangered succulents?

Many rare succulents can be legally purchased when they have been propagated by reputable nurseries. However, international trade in certain species may be regulated by CITES or national laws, and collecting protected plants from the wild may be illegal. When purchasing particularly rare species, look for nursery-propagated plants from sellers who can provide reliable information about their origin.

What are some of the most unusual succulents to grow?

Living stones (Lithops), split rock (Pleiospilos nelii), spiral aloe (Aloe polyphylla), elephant’s foot (Dioscorea elephantipes), baseball plant (Euphorbia obesa), and translucent-leaved Haworthia cooperi are notable for their unusual forms. Their growing requirements vary considerably, so choosing a plant suited to your climate and experience level is more important than rarity alone.

36 Rare and Unusual Succulents: Species, Traits & Growing Guide

Rare and unusual succulents can stand out for many reasons, from highly restricted natural ranges and unusual growth forms to remarkable colors, textures, and adaptations. The 36 plants below highlight this diversity, including true cacti, living stones, caudiciform plants, and other distinctive succulents from around the world.

Quick Comparison of 36 Rare and Unusual Succulents

Succulent	Native region	Unusual trait	Wild status / concern	Growing difficulty
Adenium obesum — Desert rose	Africa to Arabian Peninsula	Swollen, water-storing stem base	IUCN Least Concern	Moderate
Adromischus cooperi — Plover eggs	South Africa	Thick, mottled leaves	IUCN Least Concern	Easy–Moderate
Agave pax	Colombia	Compact rosette of substantial succulent leaves	Restricted geographic occurrence	Moderate
Albuca spiralis — Frizzle sizzle	South Africa	Corkscrew-shaped leaves	Included for unusual form rather than threatened status	Moderate
Alluaudia procera — Madagascar ocotillo	Madagascar	Tall, spiny, water-storing stems	IUCN Least Concern	Moderate
Aloe polyphylla — Spiral aloe	Lesotho	Remarkably symmetrical spiral rosette	Range-restricted; conservation concern	Difficult
Ariocarpus fissuratus — Living rock cactus	United States & Mexico	Rock-like camouflage	IUCN Least Concern	Difficult
Ariocarpus trigonus	Mexico	Prominent triangular tubercles	IUCN Least Concern	Difficult
Astrophytum asterias — Star cactus	United States & Mexico	Flattened, spineless, star-shaped body	IUCN Vulnerable	Moderate
Aeonium arboreum — Tree aeonium	Macaronesia	Rosettes on branching woody stems	Included for unusual form rather than threatened status	Easy–Moderate
Blossfeldia liliputana — Dwarf cactus	Bolivia & Argentina	Exceptionally small cactus	IUCN Least Concern	Difficult
Conophytum spp.	Southern Africa	Fused leaf pairs resembling pebbles	Varies by species	Difficult
Lithops aucampiae — Living stone	South Africa	Stone-like camouflage	Varies by subspecies; nominate subspecies Least Concern	Moderate
Dioscorea elephantipes — Elephant’s foot	South Africa	Large, cracked, woody caudex	Included primarily for unusual caudex	Moderate
Discocactus heptacanthus	South America	Low-growing body with mature cephalium	Status varies with taxonomic treatment/subtaxon	Difficult
Echeveria spp.	Mexico and other parts of the Americas	Geometric rosettes	Varies by species	Easy–Moderate
Echinopsis chamaecereus — Peanut cactus	Argentina	Clusters of finger-like stems	Included for unusual form; widely cultivated	Easy
Echinocereus rigidissimus — Rainbow cactus	United States & Mexico	Colorful bands of dense radial spines	Included primarily for unusual spine coloration	Moderate
Euphorbia lactea ‘Cristata’ — Crested euphorbia	Cultivated form of Asian species	Fan-shaped crested growth	Cultivated form; wild status not applicable	Moderate
Euphorbia obesa — Baseball plant	South Africa	Nearly spherical, spineless body	Rare in the wild; historic collection pressure	Moderate
Fenestraria rhopalophylla — Baby toes	Namibia & South Africa	Translucent windows on finger-like leaves	Status varies by taxon	Moderate
Gymnocalycium mihanovichii	South America	Ribbed body; colorful grafted forms	Wild status applies to species, not cultivated moon-cactus forms	Moderate
Pygmaeocereus densiaculeatus — formerly Haageocereus tenuis	Peru	Small, unusual Peruvian cactus	IUCN Critically Endangered under the synonym Haageocereus tenuis	Difficult
Haworthia cooperi — Window haworthia	South Africa	Translucent leaf tips	Included primarily for unusual leaf adaptation	Easy–Moderate
Haworthia truncata	South Africa	Flat-topped, windowed leaves	Restricted South African distribution	Moderate
Kalanchoe rhombopilosa	Madagascar	Mottled silver-gray foliage	Included primarily for unusual foliage	Moderate
Mammillaria herrerae — Golf-ball cactus	Mexico	Dense white radial spines	Conservation concern; collection pressure	Difficult
Crassothonna capensis — Ruby necklace	South Africa	Fleshy leaves that can develop ruby-purple tones	Included primarily for unusual coloration	Easy
Parodia rechensis	Brazil	Small, compact ribbed cactus	IUCN Critically Endangered	Moderate
Pelecyphora aselliformis	Mexico	Comb-like spines on elongated tubercles	Conservation concern; responsible sourcing important	Difficult
Monanthes wildpretii — Pelotilla de Chinamada	Tenerife, Canary Islands	Extremely restricted natural range	Range-restricted and legally protected	Difficult
Pleiospilos nelii — Split rock	South Africa	Thick leaves resembling split stones	Included primarily for stone mimicry	Moderate
Stapelia spp. — Carrion flowers	Africa	Star-shaped flowers with carrion-like odors	Varies by species	Easy–Moderate
Tephrocactus articulatus — Paper-spine cactus	Argentina	Segmented stems with papery spines	IUCN Least Concern	Moderate
Crassula ‘Buddha’s Temple’	Cultivated hybrid	Geometric columns of tightly stacked leaves	Cultivated hybrid; wild status not applicable	Moderate
Welwitschia mirabilis	Angola & Namibia	Only two persistent foliage leaves	Distinctive wild populations; not a cactus	Difficult

Note: Growing difficulty is a general guide and may vary with climate, growing conditions, and experience.

36 Rare and Unusual Succulents

The plants below include genuinely range-restricted or threatened species as well as succulents that are notable for unusual shapes, growth habits, or adaptations. Some are relatively common in cultivation even though their appearance is extraordinary, so “unusual” should not be interpreted as a formal conservation category.

1. Adenium obesum — Desert Rose

Adenium obesum, commonly called desert rose, is a semi-succulent shrub native to parts of tropical Africa and the Arabian Peninsula. Its most distinctive feature is its thickened trunk and stem base, which gives mature plants a sculptural appearance beneath clusters of showy pink to reddish flowers.

Despite its exotic appearance, Adenium obesum is not considered globally rare and is currently classified as Least Concern by the IUCN. The plant contains cardiac glycosides, so its sap and other plant parts should be handled with appropriate care.

2. Adromischus cooperi — Plover Eggs

Native to South Africa’s Cape Provinces, Adromischus cooperi is a small succulent valued for its thick, irregularly shaped leaves, which may develop contrasting purple or reddish markings. Its compact growth makes it particularly appealing to collectors of miniature succulents.

Although unusual in appearance, A. cooperi is currently classified as Least Concern by the IUCN, illustrating how an unusual or collectible plant is not necessarily threatened in the wild.

3. Agave pax

Agave pax is a comparatively recently described agave native to Colombia. Like other agaves, it develops a rosette of substantial succulent leaves, but its geographic distribution and relative unfamiliarity make it much less commonly encountered than widely grown ornamental agaves.

Its inclusion in this guide reflects its unusual status in cultivation rather than a claim that it is globally threatened.

4. Albuca spiralis — Frizzle Sizzle

Albuca spiralis is a bulbous plant native to South Africa’s Western Cape and is best known for its distinctive curling foliage. Under favorable growing conditions, its narrow leaves develop into corkscrew-like spirals that give the plant its popular name, frizzle sizzle.

Although frequently grouped with unusual succulents in horticulture, A. spiralis is a bulbous geophyte rather than a cactus. Its remarkable foliage, rather than extreme rarity, is the primary reason for its inclusion here.

5. Alluaudia procera — Madagascar Ocotillo

Alluaudia procera is native to the dry, spiny vegetation of southern Madagascar. It develops tall, water-storing stems lined with small fleshy leaves and sharp spines, creating a cactus-like appearance even though it belongs to a completely different plant family.

In the wild, it can eventually develop into a substantial tree more than 15 m (49 ft) tall. Despite its distinctive appearance and Madagascan distribution, its current IUCN classification is Least Concern.

6. Aloe polyphylla — Spiral Aloe

Spiral aloe is one of the most visually distinctive aloes, producing fleshy leaves arranged in a remarkably regular spiral. It is native to the mountains of Lesotho, where it occurs at high elevations under conditions quite different from those experienced by many familiar cultivated aloes.

Its geometric growth habit has made it highly desirable among succulent enthusiasts, but it can be challenging to grow successfully outside conditions suited to the species. Plants should be obtained from reputable propagated stock rather than collected from wild populations.

7. Ariocarpus fissuratus — Living Rock Cactus

Ariocarpus fissuratus is a slow-growing cactus native to parts of the southwestern United States and Mexico. Its flattened, textured tubercles allow much of the plant to blend into rocky surroundings, giving rise to the common name living rock cactus.

Its unusual appearance and slow growth make it popular with specialist cactus collectors. Despite that collector appeal, its current IUCN classification is Least Concern.

8. Ariocarpus trigonus

Native to the Mexican states of Tamaulipas and Nuevo León, Ariocarpus trigonus is a low-growing cactus with prominent triangular tubercles rather than the conventional ribs associated with many cacti. Mature plants can produce comparatively large, pale yellow flowers from the center.

Its slow growth and unusual form make it attractive to specialist collectors, although its current IUCN classification is Least Concern.

9. Astrophytum asterias — Star Cactus

Astrophytum asterias, also called star cactus or sand-dollar cactus, is native to southern Texas and northeastern Mexico. Its flattened, spineless body is divided into broad ribs and often marked with small white flecks, creating an appearance quite unlike that of many familiar cacti.

Unlike several plants included primarily for unusual appearance, A. asterias has significant conservation concerns and is currently classified as Vulnerable by the IUCN.

10. Aeonium arboreum — Tree Aeonium

Aeonium arboreum is a branching succulent that forms rosettes of fleshy leaves at the ends of woody stems. Dark-leaved cultivated selections can develop deep burgundy to nearly black foliage under suitable growing conditions and are often sold under names associated with “black rose” aeoniums.

The dark coloration is characteristic of particular cultivated forms rather than every A. arboreum. Its branching rosettes and dramatic cultivated selections make it notable for appearance rather than extreme rarity.

11. Blossfeldia liliputana — Dwarf Cactus

Blossfeldia liliputana is a remarkably small cactus native to Bolivia and northwestern Argentina. Its tiny mature stems make it exceptional among cacti, particularly when compared with the towering columnar species often associated with the family.

Its diminutive size and specialized growth have made it interesting to collectors, but small size does not indicate conservation risk. The species is currently classified as Least Concern by the IUCN.

12. Conophytum spp.

Conophytum is a genus of miniature succulents native to southern Africa rather than a single species. Many produce pairs of fleshy leaves fused into compact bodies that can resemble pebbles, buttons, or tiny rounded stones.

These unusual forms help explain the genus’s popularity among collectors of mesembs. Because Conophytum contains numerous species, distribution, rarity, flower characteristics, and conservation status need to be considered at the species level.

13. Lithops aucampiae — Living Stone

Lithops aucampiae is a South African succulent composed primarily of a pair of thick leaves separated by a fissure. Its patterned upper surfaces can closely resemble surrounding stones and gravel, making it an outstanding example of camouflage among succulents.

Flowers emerge from the fissure between the leaves during the plant’s reproductive cycle. Its remarkable stone-like camouflage, rather than extreme rarity, is the primary reason for its inclusion in this guide.

14. Dioscorea elephantipes — Elephant’s Foot

Dioscorea elephantipes is a South African caudiciform plant distinguished by a large, mostly above-ground caudex covered in thick, corky plates. As it matures, the cracked surface can resemble elephant skin or a tortoise shell.

Much thinner climbing stems and foliage emerge above the massive caudex, creating a dramatic contrast between its water-storage structure and seasonal growth. This unusual combination makes it one of the most distinctive caudiciform plants in the collection.

15. Discocactus heptacanthus

Discocactus heptacanthus is a Brazilian cactus with a low-growing body and a specialized flowering structure, known as a cephalium, that develops when the plant reaches maturity.

Older botanical and horticultural references may list certain plants under the name Discocactus subterraneo-proliferans, which Kew currently treats as a synonym of D. heptacanthus. Mentioning both names can help collectors recognize specimens and references published under the older taxonomy.

16. Echeveria spp.

Echeveria is a diverse genus of succulents native primarily to Mexico and extending into other parts of the Americas. Many species and cultivars form compact rosettes of fleshy leaves in shades ranging from green and blue-gray to pink, purple, and reddish tones.

Echeverias are among the most widely cultivated succulents, so the genus itself is not rare. They are included here because individual species, hybrids, cultivars, and unusual forms can vary dramatically in appearance and availability.

17. Echinopsis chamaecereus — Peanut Cactus

Commonly called peanut cactus, Echinopsis chamaecereus forms clusters of narrow, finger-like stems that spread readily through offsets. Its comparatively large, brightly colored flowers create a striking contrast with the compact stems.

This species is better described as unusual than rare in cultivation. Its freely branching growth also makes it considerably easier to propagate than many of the slow-growing collector cacti featured in this guide.

18. Echinocereus rigidissimus — Rainbow Cactus

Echinocereus rigidissimus is native to parts of the southwestern United States and Mexico. Its stems are densely covered with short radial spines that can form contrasting bands of color, giving rise to common names such as rainbow cactus and rainbow hedgehog cactus.

Mature plants can also produce conspicuous pink to magenta flowers. The combination of colorful spine bands and large flowers gives this species much of its ornamental appeal.

19. Euphorbia lactea ‘Cristata’ — Crested Euphorbia

The crested form of Euphorbia lactea develops broad, irregular, fan-shaped growth rather than the conventional upright stems of the species. This growth pattern, known as fasciation or cresting, produces the distinctive coral-like appearance for which the plant is prized.

Crested E. lactea is frequently grafted onto another euphorbia rootstock in cultivation, although grafting is not what creates the crest. Like other euphorbias, the plant produces irritating milky latex and should be handled carefully.

20. Euphorbia obesa — Baseball Plant

Native to South Africa, Euphorbia obesa develops an almost spherical to cylindrical body marked by vertical ribs, giving young specimens their familiar baseball-like appearance. It lacks the prominent spines associated with many globular cacti and is a euphorbia rather than a cactus.

This species has genuine conservation significance. SANBI describes it as extremely rare in the wild and notes that historical overcollection placed severe pressure on wild populations. Fortunately, it is now extensively propagated in cultivation.

21. Fenestraria rhopalophylla — Baby Toes

Fenestraria rhopalophylla is a southern African succulent with clusters of upright, finger-like leaves that explain the common name baby toes. Their tips contain translucent areas known as windows, which allow light to reach internal tissues while much of the leaf remains protected close to or beneath the soil surface.

This unusual adaptation helps the plant survive in harsh, dry habitats and makes its foliage immediately recognizable among other small succulents.

22. Gymnocalycium mihanovichii

Gymnocalycium mihanovichii is a small South American cactus with a flattened to globular, strongly ribbed body. Cultivated selections include vividly colored forms containing little or no chlorophyll, which are commonly grafted onto green cactus rootstock.

These colorful grafted plants are widely known as moon cacti. The green rootstock provides the photosynthetic support needed by chlorophyll-deficient forms, creating one of the most recognizable grafted cacti in cultivation.

23. Pygmaeocereus densiaculeatus — Formerly Haageocereus tenuis

Pygmaeocereus densiaculeatus is a Peruvian cactus associated with dry coastal habitats and is notable for its compact growth and restricted natural occurrence.

The name Haageocereus tenuis is still encountered in older horticultural and botanical references, but Kew currently treats it as a synonym of Pygmaeocereus densiaculeatus. Using the accepted name while retaining the older synonym helps readers identify references and plants labeled under either name.

The IUCN assessment published under the synonym Haageocereus tenuis classifies the taxon as Critically Endangered.

24. Haworthia cooperi — Window Haworthia

Haworthia cooperi is a small South African succulent prized for rosettes of fleshy leaves with translucent areas near their tips. These leaf windows allow light to penetrate deeper into the tissues and give healthy plants their characteristic glassy appearance.

Its compact growth and translucent foliage make it especially appealing as a collector plant. It generally performs best with bright light while receiving protection from the harsh exposure tolerated by many desert cacti.

25. Haworthia truncata

Haworthia truncata is native to South Africa’s southwestern Cape region and has one of the most distinctive leaf forms among haworthias. Its thick leaves grow in rows with flattened upper surfaces, making them appear as though their tips have been cleanly cut away.

The flattened surfaces contain translucent window tissue that allows light into the leaves while much of the plant remains protected close to the soil surface. This combination of geometric growth and specialized leaf windows gives the species its unmistakable appearance.

26. Kalanchoe rhombopilosa

Native to Madagascar, Kalanchoe rhombopilosa is a compact succulent valued for small, thick leaves that may appear silvery gray or green and are often marked with darker mottling.

Its subtle coloration and patterned foliage give it a very different appearance from the larger, brightly flowering kalanchoes commonly grown as houseplants. Its collector appeal comes primarily from this distinctive foliage rather than extreme rarity.

27. Mammillaria herrerae — Golf-Ball Cactus

Mammillaria herrerae is a small Mexican cactus densely covered with fine white radial spines, producing the rounded, pale appearance that inspired the common name golf-ball cactus. Mature plants can produce conspicuous pink flowers that appear especially large beside the compact body.

Its unusual appearance has made it desirable among cactus collectors. Responsible sourcing is particularly important for scarce Mexican cacti that may be affected by collection pressure in their natural habitats.

28. Crassothonna capensis — Ruby Necklace

Crassothonna capensis, commonly called ruby necklace, is a trailing South African succulent with fleshy, bean-like leaves. It is still frequently sold under its older botanical name, Othonna capensis.

The foliage can develop reddish, purple, or burgundy tones under suitable growing conditions, while yellow daisy-like flowers provide additional contrast. Color intensity varies with growing conditions rather than remaining permanently ruby red.

29. Parodia rechensis

Parodia rechensis is a small cactus native to Rio Grande do Sul in southern Brazil. It develops a compact, ribbed body armed with spines and can form clusters as it grows.

Its conservation status is particularly significant: the species is classified as Critically Endangered by the IUCN. Plants purchased for cultivation should therefore come from legitimate propagated stock rather than wild collection.

30. Pelecyphora aselliformis

Native to Mexico, Pelecyphora aselliformis is a small cactus notable for elongated tubercles topped by flattened, comb-like arrangements of spines. This intricate surface texture gives it an appearance quite different from conventional ribbed or columnar cacti.

Its slow growth and distinctive morphology have made it desirable among specialist cactus collectors, making responsible sourcing particularly important.

31. Monanthes wildpretii — Pelotilla de Chinamada

Monanthes wildpretii, locally known as Pelotilla de Chinamada, is a highly range-restricted succulent endemic to Tenerife in the Canary Islands. It occurs in the Anaga region, where it grows in rock fissures within a very limited habitat.

A 2015 census reported approximately 6,600 adult individuals, and the species receives special legal protection. Although that population estimate is considerably higher than older figures sometimes repeated online, its extremely restricted distribution makes protection of its natural habitat important.

32. Pleiospilos nelii — Split Rock

Pleiospilos nelii is a South African mesemb with one or a few pairs of thick, rounded leaves separated by a deep fissure. Their mottled gray-green surfaces resemble surrounding stones, giving the plant its familiar common name, split rock.

New leaves emerge from the center as older pairs are gradually replaced, and showy flowers can appear from the central fissure. Its pronounced seasonal growth cycle makes appropriate watering particularly important in cultivation.

33. Stapelia spp. — Carrion Flowers

Stapelia is a genus of African succulents known for fleshy, angular stems and elaborate star-shaped flowers. Depending on the species, the blooms can vary considerably in size, color, pattern, and texture.

Many Stapelia species produce carrion-like odors that attract flies, which can act as pollinators. Because the genus contains numerous species, distribution and conservation status should be evaluated at the species level.

34. Tephrocactus articulatus — Paper-Spine Cactus

Native to Argentina, Tephrocactus articulatus is composed of rounded to cylindrical stem segments that can detach relatively easily. Some forms develop broad, flattened, papery spines that give the plant its distinctive common name.

Despite its unusual appearance, the species is currently classified as Least Concern by the IUCN. Its segmented growth and extraordinary spines make it a particularly distinctive cactus for collectors.

35. Crassula ‘Buddha’s Temple’

Crassula ‘Buddha’s Temple’ is a cultivated succulent known for tightly stacked leaves that form remarkably geometric, square columns. As the stems grow, the overlapping gray-green leaves create a tiered appearance that inspired the cultivar’s architectural name.

As a horticultural cultivar, ‘Buddha’s Temple’ does not have a wild conservation status of its own. Its appeal comes from its distinctive growth form and collector interest rather than rarity in nature.

36. Welwitschia mirabilis

Few desert plants look quite like Welwitschia mirabilis. Native to the Namib Desert of Angola and Namibia, it produces only two persistent foliage leaves that continue growing throughout the plant’s extraordinarily long life, gradually splitting and fraying into ribbon-like sections.

Individual plants can survive for hundreds of years, with some specimens thought to be considerably older. The species obtains water from sources that include fog and groundwater, helping it persist in the exceptionally arid Namib. Although frequently included in collections of bizarre drought-adapted plants, Welwitschia is a gymnosperm rather than a cactus.

Where Do Rare and Unusual Succulents Grow?

Rare and unusual succulents occur in dry and seasonally dry habitats around the world, but several regions are especially rich in succulent diversity. Southern Africa is particularly notable, with plants such as Lithops, Conophytum, Haworthia, Euphorbia obesa, and Dioscorea elephantipes, while Madagascar is home to distinctive species such as Alluaudia procera. Mexico and the southwestern United States support numerous unusual cacti, including Ariocarpus and Astrophytum, while South America is home to species such as Blossfeldia liliputana and Parodia rechensis.

These geographic patterns reflect millions of years of adaptation to different climates, soils, elevations, and seasonal rainfall patterns. As a result, plants that are all described horticulturally as “succulents” can have very different growing requirements.

Why Do Some Succulents Look So Unusual?

The unusual shapes of succulents are more than decorative curiosities. Many developed as adaptations to dry environments, intense sunlight, seasonal rainfall, grazing pressure, or other environmental conditions. Others, such as crested and variegated plants, owe their unusual appearance to changes in how the plant grows or produces chlorophyll.

Caudiciform Plants

Caudiciform plants develop a conspicuously swollen structure, known as a caudex, that may involve enlarged stems, roots, or both. These structures often help plants store water and nutrients during unfavorable conditions.

Dioscorea elephantipes, or elephant’s foot, is a striking example. Its large, partially exposed caudex develops thick, corky plates as it matures, while much thinner climbing stems and leaves grow above it. Adenium obesum also develops a swollen stem base that contributes to its distinctive sculptural appearance.

Mesembs and Stone Mimicry

Mesembs are a diverse group of mostly southern African succulents that includes Lithops, Conophytum, and Pleiospilos. Some have evolved compact bodies and colors that closely resemble the rocks and gravel surrounding them.

Lithops are among the best-known examples. Most of the visible plant consists of a pair of thick leaves separated by a fissure, with patterned upper surfaces that can make the plant difficult to distinguish from nearby stones.

Pleiospilos nelii, or split rock, uses a similar strategy. Its thick, rounded leaves resemble pieces of stone, while flowers emerge from the central fissure between the leaves.

Leaf Windows

Some succulents have translucent or partially translucent areas known as leaf windows. These specialized tissues allow light to penetrate deeper into leaves while much of the plant remains protected close to or beneath the soil surface.

Haworthia cooperi is a particularly striking example, with translucent areas near the tips of its fleshy leaves. Haworthia truncata also has flattened, windowed leaf surfaces that give the plant its characteristic cut-off appearance.

Crested Growth

Crested growth, or fasciation, occurs when the plant’s growing point develops along an elongated line rather than from a conventional single point. Instead of producing ordinary cylindrical or branching growth, the plant may develop a broad, wavy, or fan-shaped form.

Euphorbia lactea ‘Cristata’ is a familiar example. Its folded, fan-like growth can resemble coral and is often grafted onto another euphorbia rootstock in cultivation.

Cresting should not be confused with variegation. A plant can be crested without being variegated, variegated without being crested, or occasionally display both characteristics.

Unusual Colors

Succulent foliage can range from green and blue-gray to burgundy, purple, pink, yellow, and nearly black. These colors may result from pigments, waxy surface coatings, genetics, or responses to growing conditions such as light and temperature.

Dark-leaved forms of Aeonium arboreum, for example, can develop deep burgundy coloration, while Crassothonna capensis, commonly called ruby necklace, may develop reddish or purple tones under suitable conditions. Variegated plants have areas containing reduced amounts of chlorophyll, creating contrasting patterns of green and lighter-colored tissue.

Unusual Flowers and Pollination

Some succulents are just as remarkable in bloom as they are out of flower. Adenium obesum produces large, colorful flowers above its swollen stems, while many Stapelia species produce elaborate star-shaped flowers with a very different pollination strategy.

The carrion-like odors produced by many Stapelia flowers attract flies, which can transfer pollen as they investigate the flowers. What smells unpleasant to people therefore serves an important reproductive function for the plant.

Rare in Cultivation vs. Rare in the Wild

The word “rare” can be confusing when discussing succulents. A plant may be difficult to find in nurseries without being threatened in nature, while another species may be widely propagated by growers even though its wild populations face significant conservation pressures.

Formal conservation categories such as Vulnerable, Endangered, and Critically Endangered are based on assessments of wild populations. They should not be determined by how expensive, unusual, or difficult to find a plant is in the horticultural trade.

Several plants in this guide demonstrate the difference:

Astrophytum asterias — The star cactus is classified as Vulnerable by the IUCN. It is native to southern Texas and northeastern Mexico but is also widely cultivated by cactus enthusiasts.
Parodia rechensis — This small Brazilian cactus is classified as Critically Endangered, making its conservation status much more serious than its availability in cultivation might suggest.
Ariocarpus fissuratus — Despite its slow growth, unusual rock-like appearance, and collector appeal, this species is currently classified as Least Concern by the IUCN.
Ariocarpus trigonus — This distinctive Mexican cactus is also currently classified as Least Concern, illustrating why collector rarity should not be confused with threat status.
Monanthes wildpretii — This Tenerife endemic has an extremely restricted natural distribution and receives special legal protection. A 2015 census recorded approximately 6,600 adult plants, considerably more than older population estimates sometimes repeated online.

Conservation assessments can also change as new population data become available. For that reason, current authoritative sources such as the IUCN Red List, national conservation agencies, and botanical institutions should be used when describing a species as Vulnerable, Endangered, or Critically Endangered.

Responsible Collecting of Rare Succulents

Collector demand can create additional pressure on naturally scarce plants, particularly when specimens are illegally removed from wild populations. Habitat loss, land-use change, invasive species, climate-related pressures, and other threats may also affect succulent populations.

When purchasing rare or unusual succulents:

Choose nursery-propagated plants whenever possible.
Buy from reputable sellers that can provide reliable information about a plant’s origin.
Be especially cautious with threatened or highly sought-after species.
Check trade restrictions when purchasing or transporting protected plants internationally.

International trade in some succulents and cacti is regulated under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), while national or regional laws may provide additional protection.

How to Grow Rare and Unusual Succulents

There is no single care routine that works for every rare or unusual succulent. Plants such as Lithops, Haworthia cooperi, Adenium obesum, Aloe polyphylla, and desert cacti come from different habitats and may have very different seasonal growth patterns. Before growing an unfamiliar species, learn about its native habitat and active growing season rather than assuming that all succulents need the same conditions.

Soil and Drainage

Good drainage is important for many succulents because prolonged waterlogging can damage roots and encourage rot. However, the ideal growing medium varies considerably among species.

Prioritize drainage. Use a growing medium that allows excess water to escape freely while providing the moisture and nutrients appropriate for the plant.
Match the mix to the species. Desert cacti and some mesembs may perform well in highly mineral growing media, while other succulents tolerate or benefit from more organic material.
Use containers with drainage holes. Excess water should be able to drain away rather than collect around the roots.

Light

Light requirements vary considerably among succulents. Some species are adapted to exposed conditions, while others naturally grow among rocks, beneath vegetation, or partially protected from intense sunlight.

Research the species. Some cacti and other sun-adapted succulents tolerate substantial direct sunlight, while others prefer protection from intense afternoon sun.
Watch shade-adapted species. Haworthia cooperi, for example, generally performs better with bright light and protection from harsh exposure than many desert cacti.
Increase sunlight gradually. Even sun-loving succulents can suffer leaf or stem damage when plants accustomed to lower light are suddenly exposed to intense sun.

Watering

Succulents store water in specialized leaves, stems, roots, or other tissues, but that does not mean every species should be watered on the same schedule.

Consider the species and season. Watering needs can change considerably depending on whether a plant is actively growing or dormant.
Allow excess water to drain. Free drainage is particularly important for plants susceptible to root and stem rot.
Avoid fixed schedules. Temperature, growing medium, container size, and seasonal growth all affect how quickly a plant uses water.

Some plants, including Lithops and other mesembs, have pronounced seasonal growth cycles during which watering may need to be greatly reduced. Research the individual species rather than automatically watering every week or every three weeks.

Temperature and Humidity

Rare succulents do not all come from hot deserts. Some originate in cool mountain environments, others from coastal deserts influenced by fog, and still others from seasonally dry tropical regions.

Consider the native climate. A plant’s natural range can provide useful clues about its tolerance of heat, cold, and humidity.
Don’t assume every succulent loves extreme heat. Aloe polyphylla, for example, comes from high-elevation mountain habitats in Lesotho.
Provide protection when necessary. Depending on the species, plants may need protection from frost, extreme heat, prolonged humidity, or other environmental extremes.

By contrast, Adenium obesum originates in much warmer regions of Africa and the Arabian Peninsula, illustrating why temperature requirements should be determined by the individual plant rather than the “succulent” label.

Dormancy and Seasonal Growth

One of the easiest mistakes to make with unusual succulents is assuming they grow continuously throughout the year. Many species have seasonal growth cycles that affect their water and temperature requirements.

Identify the active growing season. Some succulents grow primarily during warmer months, while others are more active during cooler periods.
Adjust watering during dormancy. Plants that slow or stop growing may require considerably less water.
Pay particular attention to mesembs. Living stones and related plants can be sensitive to watering at the wrong stage of their growth cycle.

Learning when a species actively grows can be just as important as knowing how much water or sunlight it prefers.

Start With the Species, Not the Label

“Rare succulent” is a collector or horticultural description, not a set of growing instructions. Rarity tells you very little about how a plant should be cared for.

When adding an unfamiliar succulent to your collection, identify it as accurately as possible and research the requirements of that particular species or cultivar. Its native habitat, seasonal growth cycle, mature size, and sensitivity to moisture or temperature will provide much more useful growing guidance than the fact that it is considered rare or unusual.

How to Propagate Rare and Unusual Succulents

Rare and unusual succulents can be propagated from seeds, cuttings, offsets, or grafting, but the best method depends on the species. Some plants readily produce offsets or root from cuttings, while slow-growing cacti and highly specialized succulents may be more successfully raised from seed or propagated by experienced growers.

Before propagating a valuable plant, identify the species and determine which methods are appropriate for it. A technique that works well for an Echeveria may not work for a Lithops, Ariocarpus, or Aloe polyphylla.

Seeds

Best for: species that don’t readily offset
Key consideration: seedlings need more consistent moisture
Watch for: very slow growth

Cuttings

Best for: species that root readily from stems or leaves
Key consideration: use clean, healthy material
Watch for: rot before roots develop

Offsets

Best for: naturally clustering plants
Key consideration: rooted offsets establish faster
Watch for: repeatedly removing offsets from specimen plants

Grafting

Best for: slow-growing, weak-rooted, or chlorophyll-deficient plants
Key consideration: scion and rootstock must be compatible
Watch for: poor vascular contact

Then retain a short explanatory paragraph under each where needed.

Propagate Rare Plants Responsibly

Propagation can help reduce demand for wild-collected specimens by making desirable plants available through cultivation. When purchasing seeds or propagation material from particularly rare or protected species, choose reputable sources and make sure the material was legally obtained.

Some succulents and cacti are subject to national protections or international trade controls, so rarity should never be treated as an invitation to collect plants, seeds, or cuttings from wild populations.

Final Sprouts of Wisdom

Rare and unusual succulents showcase an extraordinary range of adaptations, from the stone-like camouflage of Lithops and the translucent leaves of Haworthia cooperi to the swollen caudex of Dioscorea elephantipes and the geometric growth of Crassula ‘Buddha’s Temple’.

But unusual appearance, rarity in cultivation, and conservation status are not the same thing. Some plants in this guide are relatively common in collections despite their remarkable forms, while others have restricted natural ranges or face genuine threats in the wild.

If you decide to grow one of these distinctive plants, start by learning about the individual species rather than relying on general succulent-care rules. Its native habitat, seasonal growth cycle, light requirements, and sensitivity to moisture can provide valuable clues to successful cultivation.

Most importantly, choose nursery-propagated plants and seeds from reputable sources, particularly when purchasing species that are threatened, protected, or highly sought after by collectors. Responsible cultivation allows gardeners to appreciate these extraordinary plants while helping reduce demand for specimens taken from the wild.