With its swollen, spine-covered trunk and tuft of leaves perched at the top, Pachypodium is one of the most striking plants nature has produced. The name says it all: from the Greek pachus (thick) and podion (foot) — the “thick foot.” These caudiciform succulents belong to the family Apocynaceae (the same family as oleanders, Adenium, and frangipani) and comprise approximately 25 recognized species, of which 20 are endemic to Madagascar and 5 to southern Africa. Their morphological diversity is astonishing: from 26-foot columnar trees (Pachypodium rutenbergianum) to 2-inch living rocks (Pachypodium brevicaule), spherical silver caudexes with yellow flowers (Pachypodium gracilius), and bottle-shaped shrubs with red blooms (Pachypodium baronii).
In cultivation, Pachypodium lamerei — the famous “Madagascar palm” — is by far the most widely grown species. It is sold in garden centers across North America, Europe, and Australia as a novelty houseplant alongside cacti and succulents. But this single species barely hints at the extraordinary diversity of the genus. Pachypodium offers a range of forms, sizes, and growing requirements that makes it one of the most fascinating genera for collectors of caudiciform plants. Every single species is listed under CITES (four on Appendix I, the rest on Appendix II), and several are critically endangered in the wild.
Taxonomy and classification
The genus Pachypodium was described by John Lindley in 1830, based on a single South African species (Pachypodium tuberosum, now a synonym of Pachypodium bispinosum). The first comprehensive treatment was by Costantin and Bois (1907, 17 species). The standard reference monograph is Rapanarivo, Lavranos, Leeuwenberg, and Röösli (1999), supplemented by Lüthy’s (2004) infrageneric classification and the molecular phylogeny of Burge et al. (2013).
Lüthy’s (2004) classification, corroborated by molecular phylogenetics, divides the Malagasy Pachypodium into three sections based primarily on flower color and growth habit:
Section Leucopodium — The columnar trees with white flowers. These are the largest Pachypodium species: Pachypodium lamerei, Pachypodium geayi, Pachypodium rutenbergianum, Pachypodium meridionale, Pachypodium menabeum, Pachypodium mikea, Pachypodium ambongense, Pachypodium decaryi. Columnar trunk, reaching 6 to 26 feet in habitat, covered in spines arranged in triads. White to cream flowers. This section includes Pachypodium lamerei, the most widely cultivated species.
Section Gymnopus — The caudiciform shrubs with yellow flowers. This is the most diverse group and the most sought-after by collectors: Pachypodium rosulatum (with subspecies gracilius, bicolor, makayense, bemarahense), Pachypodium brevicaule (with subsp. leucoxanthum), Pachypodium densiflorum, Pachypodium horombense, Pachypodium eburneum, Pachypodium enigmaticum, Pachypodium stenanthum. Prostrate or swollen-caudex habit, often spherical or flattened bottle-shaped. Yellow to orange flowers. Many are micro-endemics confined to a single inselberg or rocky massif — making them both fascinating and extremely vulnerable.
Section Porphyropodium — The bottle trees with red flowers. Only two species: Pachypodium baronii and Pachypodium windsorii. Bottle-shaped trunk, bright red flowers (the only red-flowered Pachypodium). Endemic to northern Madagascar, extremely rare in habitat — Pachypodium windsorii is known from just two populations.
The five African species do not belong to any of these Malagasy sections. Molecular phylogenetics (Burge et al. 2013) places them in two distinct lineages: the Pachypodium lealii + Pachypodium saundersii clade (southern Africa, white to pink flowers) and the Pachypodium namaquanum + Pachypodium succulentum + Pachypodium bispinosum clade (South Africa, tuberous underground caudex). The latter group includes the only frost-tolerant Pachypodium species.
Species by growth form
Columnar species — the “Madagascar palms”
These are the arborescent species of section Leucopodium, the most visible and the easiest to grow. Their columnar, spiny trunk supports a crown of leaves at the top — hence the popular name “Madagascar palm,” although they have no relationship whatsoever to true palms.
| Species | Height in habitat | Flowers | Key feature | CITES |
|---|---|---|---|---|
| Pachypodium lamerei | 10–20 ft (3–6 m) | White | The world’s most widely cultivated Pachypodium. Three varieties (var. lamerei, var. ramosum, var. fiherenense). USDA 10b–11. | II |
| Pachypodium geayi | 10–20 ft (3–6 m) | White | Frequently confused with Pachypodium lamerei. Narrower, downy leaves; paler spines. USDA 10b–11. | II |
| Pachypodium rutenbergianum | 16–26 ft (5–8 m) | White | The largest species in the genus. Massive silver trunk. Trunk fibers used as rope in Madagascar. USDA 10b–11. | II |
| Pachypodium meridionale | 10–16 ft (3–5 m) | White | Southwestern Madagascar. Some authors treat it as a synonym of Pachypodium rutenbergianum. USDA 10b–11. | II |
| Pachypodium mikea | 10–16 ft (3–5 m) | White | Described by Lüthy in 2005. Southwestern dry forest. USDA 10b–11. | II |
Semi-arborescent bottle trees
| Species | Height | Flowers | Key feature | CITES |
|---|---|---|---|---|
| Pachypodium ambongense | 3–5 ft (1–1.5 m) | White | Spines up to 4 inches (10 cm). Northwestern Madagascar. Very rare in cultivation. | I |
| Pachypodium decaryi | 3–6 ft (1–2 m) | White | Very reduced spines. Limestone karst of Ankarana and Montagne des Français. | I |
| Pachypodium menabeum | 6–10 ft (2–3 m) | White | Long treated as a synonym of Pachypodium lamerei, reinstated as a distinct species. | II |
| Pachypodium baronii | 3–10 ft (1–3 m) | Red | One of only two red-flowered Pachypodium. Nearly spineless. Northern Madagascar. | I |
| Pachypodium windsorii | 1.5–3 ft (0.5–1 m) | Red | Globose base, vivid red flowers with white eye. Known from only two populations near Diego-Suarez. | I |
Caudiciform species — the “caudex plants”
These are the stars of the genus for collectors. Their short, swollen, often spherical trunk — the caudex — stores water and gives these plants extraordinary sculptural silhouettes. All belong to section Gymnopus and bear yellow flowers.
| Species | Caudex size | Flowers | Key feature | CITES |
|---|---|---|---|---|
| Pachypodium rosulatum | Ø 6–12 in (15–30 cm) | Yellow | Type species of section Gymnopus. Complex of 5 subspecies (subsp. rosulatum, gracilius, bicolor, makayense, bemarahense). Sap used as glue in Madagascar. USDA 10b–11. | II |
| Pachypodium rosulatum subsp. gracilius | Ø 4–8 in (10–20 cm), spherical | Bright yellow | Perfectly spherical silver caudex. Highly prized by Japanese and European collectors. Very sensitive during winter dormancy. USDA 10b–11. | II |
| Pachypodium brevicaule | Ø 8–24 in (20–60 cm), h. < 4 in | Yellow | The most atypical species: flattened caudex resembling “molten silver lava.” Altitude 5,200–6,200 ft (1,600–1,900 m). Subsp. leucoxanthum has white flowers. USDA 10b–11. | II |
| Pachypodium densiflorum | Ø 6–16 in (15–40 cm) | Dense yellow | Compact inflorescences. Central Madagascar, mid-elevation. Frequently hybridized in cultivation with Pachypodium brevicaule. USDA 10b–11. | II |
| Pachypodium horombense | Ø 4–10 in (10–25 cm) | Yellow (large, Ø 2 in) | Gourd-shaped caudex. Horombe Plateau, southern Madagascar. Stouter spines than Pachypodium rosulatum. USDA 10b–11. | II |
| Pachypodium eburneum | Ø 4–16 in (10–40 cm) | White | The white-flowered exception in a yellow-flowered section. Fewer than 100 individuals remain in habitat (Mount Ibity). Critically Endangered. USDA 10b–11. | II |
African species
The five African species form two lineages phylogenetically distinct from the Malagasy Pachypodium. Two of them — Pachypodium succulentum and Pachypodium bispinosum — have a subterranean tuberous caudex and are the only Pachypodium species that tolerate brief freezing temperatures (down to 14–23 °F / −5 to −10 °C), making them viable for outdoor cultivation in USDA zones 9a–9b.
| Species | Range | Flowers | Key feature | CITES |
|---|---|---|---|---|
| Pachypodium namaquanum | Namibia, South Africa (Richtersveld) | Reddish-brown, greenish | The “Halfmens” (half-human). Unbranched columnar, apex always tilted northward. Nama legend. Up to 8 ft (2.5 m). USDA 10a–11. | II |
| Pachypodium lealii | Angola, Namibia, Botswana | White to pink | The “Bottle tree.” Swollen trunk, wavy pubescent leaves. Source of arrow poison. USDA 10a–11. | II |
| Pachypodium saundersii | South Africa, Eswatini, Mozambique, Zimbabwe | White to pink | The “Kudu lily.” Partially subterranean caudex, scrambling or trailing branches, fragrant flowers. USDA 9b–11. | II |
| Pachypodium succulentum | South Africa (Eastern & Western Cape) | Pink to red | Entirely subterranean caudex (turnip-shaped, Ø 6–24 in / 15–60 cm). The hardiest Pachypodium: tolerates brief exposure to 14 °F (−10 °C). Used in traditional beer brewing. USDA 8b–10. | II |
| Pachypodium bispinosum | South Africa (Eastern Cape) | Pink to pale mauve | Subterranean caudex, spines in pairs (hence the name). Hardy to 18–23 °F (−5 to −8 °C) briefly. USDA 9a–10. | II |
Pachypodium vs. Adenium: telling them apart
Pachypodium is frequently confused with Adenium (desert roses), which belongs to the same family (Apocynaceae) and shares a similar caudiciform habit. However, phylogenetic analyses show the two genera are less closely related than was once assumed — they sit in different subfamilies within Apocynaceae. The most practical differences for growers are sap (clear and watery in Pachypodium, milky white latex in Adenium), spines (present in all Pachypodium, absent in Adenium), and geographic origin (Madagascar and southern Africa for Pachypodium; East Africa and the Arabian Peninsula for Adenium).
Conservation: a genus entirely protected under CITES
Pachypodium is one of the few plant genera in which every species without exception is listed under CITES (the Convention on International Trade in Endangered Species). Four species are on Appendix I (international commercial trade prohibited): Pachypodium ambongense, Pachypodium baronii, Pachypodium decaryi, and Pachypodium windsorii. All other species are on Appendix II (trade regulated, permit required). The three most heavily traded species are Pachypodium lamerei, Pachypodium rosulatum, and Pachypodium brevicaule, mostly as artificially propagated live plants.
The threats facing the genus in Madagascar are severe and multiplying: deforestation (slash-and-burn agriculture, annual wildfires, mining), illegal collection for the international horticultural trade (caudex plants, particularly Pachypodium gracilius and Pachypodium brevicaule, command high prices on the Japanese and European collector markets), and the extreme micro-endemism of many species, confined to a single granite inselberg or limestone massif. When the sole habitat of a species is destroyed, the species disappears with it.
Seed propagation in cultivation is the best long-term survival insurance for these species. Several ex situ conservation programs exist, including a project in the Canary Islands (Gran Canaria) that has been propagating all Pachypodium species from seed since the 2010s, and reference collections at botanical gardens in Zurich, Kew, and Tsimbazaza (Antananarivo).
Container cultivation: the fundamentals
Despite their diversity, all Pachypodium share certain fundamental requirements, summarized below. Species-specific differences are detailed in the individual species profiles.
| Parameter | General recommendation |
|---|---|
| Light | Full sun is non-negotiable. South- or southwest-facing window indoors. Outdoors from May through October wherever possible. Columnar species (Pachypodium lamerei, Pachypodium geayi) tolerate slightly less light than caudiciform species. |
| Temperature | Minimum 55–60 °F (12–15 °C) for Malagasy species (32 °F / 0 °C = death). African species with subterranean caudex (Pachypodium succulentum, Pachypodium bispinosum) tolerate brief exposure to 14–23 °F (−5 to −10 °C) dry. |
| Watering | Generous in summer (allow the substrate to dry completely between waterings). Reduce sharply in fall. Stop entirely or nearly so in winter for species that drop their leaves. Never water a leafless Pachypodium. |
| Substrate | Extremely well-draining, mineral-dominant mix (60–80% inorganic material: pumice, perlite, coarse sand, lava rock). Pachypodium rots easily in overly organic substrates. |
| Fertilizer | Low-nitrogen fertilizer (NPK ratio approximately 2-7-7 or 5-10-10), once a month from April through September at half or quarter strength. No fertilizer in winter. |
| Repotting | In spring, every 2–3 years. Use a heavy container (terracotta) to prevent top-heavy columnar species from toppling. Handle with thick gloves (spines + irritant sap). |
| Winter dormancy | Most species shed their leaves in fall and enter dormancy. This is normal. Cease watering. Maintain at 55–65 °F (12–18 °C) with maximum light. New foliage in spring signals the end of dormancy. |
The golden rule: never water a leafless Pachypodium. This is the number one cause of death in cultivation. When the plant drops its leaves, it is signaling that it has entered dormancy — it is no longer taking up water, and any moisture at this stage causes trunk or caudex rot, often irreversible.
Special care for caudiciform species (section Gymnopus)
The yellow-flowered caudiciform species (Pachypodium rosulatum, Pachypodium gracilius, Pachypodium brevicaule, Pachypodium densiflorum, Pachypodium horombense, Pachypodium eburneum) are more demanding than the columnar species. Winter dormancy is the most critical period: a water-logged caudex that loses its leaves in a 68 °F (20 °C) apartment is doomed. Managing this period requires a delicate balance of dryness, light, and temperature.
Specialists recommend not cutting off water entirely for the small-leaved caudiciform species (unlike the columnar types): a very light soil moistening every 3 to 4 weeks prevents the fine feeder roots from dying of desiccation. The risk of rot is real, but so is the risk of total root loss from excessive dryness — and a Pachypodium gracilius that loses all its roots in winter is extremely difficult to recover in spring.
Outdoor cultivation in warm climates
In USDA zone 10a or warmer (frost-free coastal Mediterranean, subtropical Florida, Southern California, coastal Australia), the Malagasy columnar species (Pachypodium lamerei, Pachypodium geayi, Pachypodium rutenbergianum) can be grown in the ground successfully, provided perfect drainage (raised bed, rocky slope, very gravelly soil) and protection from prolonged winter rain (overhang, sheltered position at the base of a south-facing wall). Wet, cool winters are more dangerous than a few nights at 35 °F (2 °C), because it is the combination of cold + moisture that kills.
The African species Pachypodium succulentum and Pachypodium bispinosum, with their underground caudex, are the only Pachypodium realistically suited to USDA zones 9a–9b (brief freezes to 14–23 °F / −5 to −10 °C). Their above-ground parts die back in frost, but the subterranean caudex survives, insulated by the soil’s thermal inertia — a mechanism comparable to that of juvenile cycads with subterranean caudex.
Toxicity
Contrary to a common misconception, Pachypodium sap is clear (never milky white like that of Adenium or Euphorbia), but it is nonetheless an irritant to skin and mucous membranes. Pachypodium lealii has traditionally been used as an arrow poison in southern Africa. All parts of the plant should be considered potentially toxic, and the spines pose an additional mechanical hazard. Wear thick gloves when repotting or handling, and keep plants away from children and pets.
Ethnobotany
In Madagascar, Pachypodium species are collectively known as “dwarf baobabs” (vontaka in Malagasy). Several species have documented traditional uses: the sap of Pachypodium rosulatum serves as glue and a wound remedy; the fibrous trunk of Pachypodium rutenbergianum is woven into rope; hollowed-out trunks of Pachypodium geayi are used as primitive beehives; the pith of Pachypodium geayi can be squeezed through cloth to produce a bitter but drinkable liquid. In South Africa, the tuberous caudex of Pachypodium succulentum is used in traditional beer brewing and as a folk remedy (hence the Afrikaans name bergkambroo).
Frequently asked questions
Is the “Madagascar palm” a real palm?
No. Pachypodium lamerei has no relationship to true palms (Arecaceae). It is a succulent in the family Apocynaceae. The common name comes from the tuft of leaves at the top of the trunk, which vaguely resembles a palm crown.
My Pachypodium has lost all its leaves — is it dead?
Almost certainly not. Leaf drop in fall and winter is normal for nearly all species — it signals the onset of dormancy. The trunk should remain firm. If the trunk is still hard and the spines are firmly anchored, the plant is alive. Stop watering and wait for spring: new leaves will emerge when light and warmth return. If the trunk is soft and spongy, however, that indicates rot (see our dedicated article: Pachypodium pests and diseases: diagnosis and treatment).
How do I get a Pachypodium to bloom indoors?
Flowering requires three conditions rarely met in a typical apartment: intense direct sunlight (at least 6 hours per day), a mature plant (5 to 10 years minimum for columnar species, 3 to 5 years for some caudiciform species), and a dry, bright winter rest. Columnar species (Pachypodium lamerei) very rarely bloom indoors at temperate latitudes. Caudiciform species (Pachypodium rosulatum, Pachypodium densiflorum) bloom more readily in a conservatory or greenhouse.
Are Pachypodium lamerei and Pachypodium geayi the same species?
No. They are two distinct species, frequently mislabeled in garden centers. The leaves of Pachypodium geayi are narrower and downy on the underside (glabrous in Pachypodium lamerei), and the spines are pale grey (dark brown in Pachypodium lamerei). In practice, most plants sold as “Madagascar palm” are Pachypodium lamerei (see our dedicated article: Pachypodium lamerei vs. Pachypodium geayi: how to tell them apart).
Are all Pachypodium species protected?
Yes. Every species in the genus is listed under CITES. Four species (Pachypodium ambongense, Pachypodium baronii, Pachypodium decaryi, Pachypodium windsorii) are on Appendix I — international commercial trade is prohibited except for scientific purposes. The rest are on Appendix II — trade is permitted under license, primarily for artificially propagated plants. Buying a Pachypodium from a garden center is perfectly legal (these plants are nursery-grown from seed), but purchasing a wild-collected specimen is a criminal offense.
Bibliography
Rapanarivo S. H. J. V., Lavranos J. J., Leeuwenberg A. J. M., Röösli W. (1999). Pachypodium (Apocynaceae): Taxonomy, Habitats and Cultivation. A.A. Balkema, Rotterdam.
Lüthy J. M. (2004). Another look at the pachypodiums of Madagascar. Bradleya, 22: 73–112.
Lüthy J. M. (2005). Pachypodium mikea: a new arborescent species from southwestern Madagascar. Cactus and Succulent Journal, 77(3): 130–135.
Burge D. O., Mugford K., Hastings A. P., Agrawal A. A. (2013). Phylogeny of the plant genus Pachypodium (Apocynaceae). PeerJ, 1: e70.
Goyder D. J., Castillon J.-B., Castillon J.-P., Rapanarivo S. H. J. V. (2020). A new combination and a correction of a geographic error in Malagasy Pachypodium (Apocynaceae). Kew Bulletin, 75: 24.
CITES (2025). CITES Pachypodium Checklist. Prepared by WCVP / Royal Botanic Gardens, Kew.
Röösli W. (2015, 2018). Pachypodium in Madagascar — Field Guide. Röösli Verlag.
Read more
This is the main reference page for our Pachypodium series. For in-depth coverage of each topic, see our specialist guides:
- How to care for a Pachypodium lamerei (Madagascar palm) indoors — Light, seasonal watering, leaf drop, repotting, toxic sap.
- My Pachypodium is losing its leaves: causes and solutions — Decision tree: normal winter drop vs. overwatering vs. cold vs. transplant shock.
- Pachypodium pests and diseases: diagnosis and treatment — Trunk and root rot, mealybugs, aphids, spider mites, rescue protocols.
- Growing Pachypodium from seed: a germination guide by species — Soaking, temperature, germination rates, seed sources.
- Pachypodium lamerei vs. Pachypodium geayi: how to tell them apart — Visual comparison table.
- Pachypodium in the ground in Mediterranean climates: field observations — Species tested, temperature limits, drainage, winter protection.