The genus Pachypodium includes roughly 25 species split between Madagascar and southern Africa, but one dominates garden centers, beginner collections, and windowsills worldwide: Pachypodium lamerei. Known as the Madagascar palm, this arborescent succulent combines a spectacular silhouette — a silvery, spine-covered trunk crowned by a tuft of glossy leaves — with a disarming ease of cultivation, provided you respect one fundamental rule: less water is better. Its ubiquity in the trade should not obscure the fact that it is a threatened wild species, endemic to southern Madagascar, listed under CITES Appendix II.
Quick facts
| Parameter | Details |
|---|---|
| Botanical name | Pachypodium lamerei Drake (1899) |
| Family | Apocynaceae |
| Subfamily | Apocynoideae |
| Common names | Madagascar palm, club foot tree, ghost men plant (en.); palmier de Madagascar (fr.); palma del Madagascar (it.) |
| Origin | Southern and southwestern Madagascar (Toliara and Anosy provinces) |
| Habitat | Xerophytic spiny thicket, rocky calcareous and gneissic slopes, from sea level to about 2,000 ft (600 m) |
| Height | 10–20 ft (3–6 m) in the wild; 3–6 ft (1–2 m) indoors; up to 20–26 ft (6–8 m) in the ground in frost-free climates |
| Habit | Arborescent, columnar, usually unbranched (branching only after injury or pruning) |
| Growth rate | 6–12 in (15–30 cm)/year in good conditions; 2–3 in (5–8 cm)/year indoors with moderate light |
| Hardiness | USDA 9b–11. Absolute minimum 41 °F (5 °C) in dry substrate; frost is fatal |
| Flowers | White with a yellow throat, fragrant, in terminal cymes. Rare indoors before age 8–10 years. |
| Toxicity | Clear irritant sap (not milky). Sharp, hooked spines. Keep away from children and pets. |
| CITES | Appendix II |
| IUCN | Least Concern (LC), but local populations declining |
| Difficulty | 2/5 — easy, provided you do not overwater |
Taxonomy
Pachypodium lamerei was described in 1899 by the French botanist Emmanuel Drake del Castillo from specimens collected in southern Madagascar. The genus name Pachypodium (from the Greek pachys, “thick,” and podion, “little foot”) refers to the swollen trunk characteristic of the genus. The specific epithet lamerei honors the French collector Charles Lamère, who cultivated the first specimens in Paris.
Within the genus, Pachypodium lamerei belongs to section Pachypodium (formerly section Cactipodium), which groups the large columnar Malagasy species. This section also includes Pachypodium geayi, Pachypodium rutenbergianum, and Pachypodium mikea. All four species share the same arborescent, spine-covered trunk habit but differ in leaf pubescence, spine color, and floral morphology.
Two varieties have been described historically:
Pachypodium lamerei var. lamerei — the type, described below.
Pachypodium lamerei var. ramosum (Costantin & Bois) Pichon — characterized by a more freely branching habit from the base and slightly broader leaves. This taxon is sometimes treated as a distinct species (Pachypodium ramosum). Its status remains debated; POWO currently treats it as a synonym of Pachypodium lamerei.
Infraspecific classification remains unstable. Populations from the southwest (Itampolo area) show morphological characters intermediate between Pachypodium lamerei and Pachypodium geayi, which has led some authors to suggest that the two species might constitute a single variable complex. Molecular analyses published to date nevertheless support their maintenance as two distinct species.
Morphology
Trunk: cylindrical, columnar, usually unbranched (monocaulous) unless injured or pruned at the apex, which induces branching. The bark is smooth, silvery grey, becoming slightly rough and brownish with age at the base. Basal diameter can reach 12–16 in (30–40 cm) on mature wild specimens. The trunk is succulent and serves as the plant’s primary water reservoir; it is firm and turgid when well hydrated, and may wrinkle slightly during drought — a normal, non-pathological signal.
Spines: arranged in triads (groups of three) at each leaf scar. They are rigid, sharp, dark brown to reddish-brown, 0.4–1 in (1–2.5 cm) long, with a slightly hooked tip. They are modified stipules — not reduced leaves as in cacti. They serve as a defense against herbivores, not as an adaptation for water storage.
Leaves: spirally arranged at the trunk apex, forming a dense terminal tuft. Blade lanceolate to oblanceolate, 6–12 in (15–30 cm) long and 1.2–2 in (3–5 cm) wide, glossy dark green on the upper surface, paler beneath, glabrous (this is the primary diagnostic character versus Pachypodium geayi). Midrib prominent, whitish-green. Petiole short, 0.2–0.4 in (5–10 mm). Leaves are deciduous — they drop naturally in autumn and winter in regions with distinct seasons.
Flowers: large, 2.8–4 in (7–10 cm) in diameter, white with a yellow throat, fragrant, borne in terminal cymes of 2–8 flowers at the top of the trunk. Corolla infundibuliform (funnel-shaped), with 5 spreading lobes. The flowers are pollinated by moths in Madagascar. In cultivation, flowering requires a mature specimen (at least 3 ft / 1 m tall, usually 5–10 years old), intense sunlight, and a pronounced winter dormancy. It remains rare indoors.
Fruit: a pair of divergent cylindrical follicles, 4–6 in (10–15 cm) long, green then brownish at maturity. They split lengthwise to release numerous elongated seeds equipped with a silky coma (hair tuft) for wind dispersal.
Sap: clear, watery, and slightly viscous (not milky like that of Euphorbia or Adenium). Irritant to the skin and mucous membranes, but markedly less toxic than the sap of Adenium, which contains cardiac glycosides.
Similar species: comparison table
| Character | Pachypodium lamerei | Pachypodium geayi | Pachypodium rutenbergianum | Pachypodium mikea |
|---|---|---|---|---|
| Leaves | Glabrous, glossy, 6–12 in (15–30 cm), dark green | Pubescent (downy) beneath, narrower, grey-green | Glabrous, broader, medium green | Glabrous, narrow, grey-green |
| Spines | Dark brown to reddish-brown | Pale grey to whitish | Dark brown, shorter | Grey, fine |
| Flowers | White with yellow throat | White with yellow throat (nearly identical) | White with yellow throat, larger | White with yellow throat |
| Habit | Unbranched, 10–20 ft (3–6 m) | Unbranched, 10–26 ft (3–8 m), more slender | Branched, 26–65 ft (8–20 m) — the largest in the genus | Unbranched, 6–13 ft (2–4 m) |
| Distribution | Southern and southwestern Madagascar | Southwestern Madagascar (more restricted) | Western and northwestern Madagascar | Southwestern coast (Mikea forest) |
| Hardiness | 41–45 °F (5–7 °C) min. | 41–45 °F (5–7 °C) min. | 41–45 °F (5–7 °C) min. | 46–50 °F (8–10 °C) min. (less cold-tolerant) |
| Availability in cultivation | Very common | Common | Uncommon | Rare |
The most frequent confusion in the trade is between Pachypodium lamerei and Pachypodium geayi. The most reliable diagnostic character is leaf pubescence: turn a leaf over. If the lower surface is smooth and hairless, it is Pachypodium lamerei. If it is downy (pubescent), it is Pachypodium geayi. Spine color confirms: dark brown in Pachypodium lamerei, pale grey in Pachypodium geayi. Cultivation requirements are identical for both species.
Distribution and habitat
Pachypodium lamerei is endemic to southern and southwestern Madagascar, primarily in the provinces of Toliara and Anosy. Its range extends roughly from Itampolo in the west to Fort-Dauphin (Tôlanaro) in the southeast, including the limestone massifs of Isalo and the Mahafaly Plateau.
The typical habitat is the Malagasy xerophytic spiny thicket — a unique ecosystem characterized by dense, low, thorny vegetation dominated by Didiereaceae (Alluaudia, Didierea), Euphorbiaceae, and Apocynaceae. Pachypodium lamerei grows on rocky calcareous or gneissic slopes, in skeletal soils with near-instant drainage, from sea level to approximately 2,000 ft (600 m).
The climate is semi-arid to arid: annual rainfall ranges from 12 to 24 in (300–600 mm), concentrated in a short wet season (December–March). The dry season (April–November) is virtually rainless. Daytime temperatures regularly exceed 95 °F (35 °C) in summer and rarely drop below 50 °F (10 °C) in winter. Frost is unknown throughout the natural range.
In this environment, Pachypodium lamerei is strictly deciduous: it sheds all its leaves during the dry season and only grows new ones when the rains arrive. The succulent trunk is the sole water reserve during 6–8 months of drought. This behavior is preserved in cultivation and explains the winter leaf drop that often alarms beginner growers.
Conservation
Pachypodium lamerei is listed under CITES Appendix II, meaning international trade is regulated and requires export permits. It is not on Appendix I (unlike Pachypodium ambongense, Pachypodium baronii, Pachypodium decaryi, and Pachypodium windsorii).
The IUCN classifies the species as Least Concern (LC), but this assessment masks a real decline in local populations. The main threats are habitat destruction (slash-and-burn agriculture, charcoal production) and collection of wild specimens for the horticultural trade. The Malagasy spiny thicket ranks among the most threatened ecosystems on Earth: less than 3% benefits from effective protection.
In practice, the vast majority of Pachypodium lamerei available in the European and North American trade are nursery-propagated (seed-grown), which is good news for conservation. Purchasing documented nursery-grown plants should always be preferred.
Cultivation
| Parameter | Recommendation |
|---|---|
| Exposure | Full sun essential. Minimum 4–6 hours of direct sun/day. South- or west-facing window ideal. |
| Watering (summer) | Generous but infrequent: every 7–14 days. Let the top half of the substrate dry out between waterings. |
| Watering (winter) | Near zero. One light moistening/month at most. No watering if the plant is leafless. |
| Substrate | Mineral and fast-draining: 60–80% inorganic (pumice, perlite, coarse sand, lava rock). Amend commercial cactus mix with at least 40–50% extra perlite. |
| Pot | Unglazed terracotta ideal. Drainage holes mandatory. Diameter = trunk base + 1–2 in (2–5 cm). |
| Repotting | Every 2–3 years in spring. Dry substrate; no watering for 7–10 days after. |
| Fertilizing | Low-nitrogen liquid fertilizer (2-7-7 or 5-10-10), half dose, once/month April through September. Nothing during dormancy. |
| Growing temperature | 65–95 °F (18–35 °C). Optimum 80–90 °F (27–32 °C). No practical upper limit. |
| Winter temperature | 50–65 °F (10–18 °C) ideal. Absolute minimum 41 °F (5 °C) in bone-dry substrate. Frost is fatal. |
| USDA hardiness | 10–11 |
Growing Pachypodium lamerei in temperate climates
Pachypodium lamerei is primarily a houseplant at temperate latitudes. Its frost tolerance is nil, ruling out permanent outdoor planting even in the mildest winter areas — a single night at 32 °F (0 °C) is enough to kill a mature specimen.
The most effective strategy combines indoor overwintering (October–May) with outdoor placement during the warm season (late May–late September). Nothing you can offer indoors — no south-facing window, no grow light — replicates the full intensity of outdoor sunlight, the natural day-to-night temperature swings, and the air circulation. A plant that spends its summers outdoors will be noticeably thicker-trunked, more densely spined, and more likely to flower than one kept indoors year-round.
Spring transition outdoors: acclimate gradually — a week in dappled shade before moving to full sun. Protect from prolonged rain (an overhang or eave is sufficient; a brief summer thunderstorm is fine and even beneficial).
Fall transition indoors: bring inside before night temperatures drop below 50 °F (10 °C), typically late September to mid-October depending on your region. Some leaf drop at the transition is normal — it is relocation shock and will resolve within a few weeks.
Winter care: place in front of the brightest window available (south-facing ideal). Reduce watering drastically. If the plant drops all its leaves, this is perfectly normal winter dormancy — stop watering, do not fertilize, do not repot, do not panic. Squeeze the trunk: if it is firm, the plant is alive. New leaves will appear in March–April.
The classic mistake: watering a leafless Pachypodium lamerei in winter. A dormant plant does not absorb water; the moisture sits in the substrate and triggers root rot that spreads into the trunk, often invisibly until it is too late. This is the number one cause of death in cultivation.
Propagation
From seed
Seed is the most reliable and most common propagation method. Fresh seeds achieve germination rates of 80–95%, making this one of the easiest Pachypodium species to grow from seed. Soak seeds for 24 hours in warm water (86 °F / 30 °C), then sow on the surface of a sterilized, free-draining mix (50% fine perlite, 30% sieved cactus mix, 20% coarse sand). Maintain at 77–86 °F (25–30 °C) under a clear cover. Germination occurs in 3–7 days. Seedlings grow fast — 4–12 in (10–30 cm) in the first year under optimal conditions — and are the most forgiving in the genus for beginner mistakes. See our detailed guide: Growing Pachypodium from seed: a germination guide by species.
From offsets
Pachypodium lamerei occasionally produces basal offsets (small globular shoots at the trunk base). Remove with a sterile blade, allow to dry and callous for 5–8 days, then pot into dry cactus mix. Do not water until roots have formed (typically 3–4 weeks).
From tip cuttings
If the top is damaged or you want to control height, the severed upper section can be used as a cutting. Let the cut surface dry for at least a week, then place on dry mineral substrate. Do not begin watering for 2–3 weeks. Rooting is slow and uncertain, but Pachypodium lamerei is one of the species in the genus that roots most readily from cuttings. The mother plant will typically produce one or more branches below the cut point.
As rootstock (grafting)
Pachypodium lamerei is the standard rootstock for accelerating the growth of slow-growing species in the genus (Pachypodium brevicaule, Pachypodium namaquanum, section Porphyropodium species). Its vigorous root system drives scion growth at several times the rate achievable on the scion’s own roots.
Pests and diseases
Trunk rot and root rot: the number one threat, caused by oomycete pathogens (Phytophthora, Pythium) in waterlogged substrate. The trunk becomes soft and spongy; brown or black patches may appear at the base. Prevention: mineral-dominant, fast-draining substrate; pots with drainage holes; no watering during dormancy. Treatment: surgical excision of all affected tissue, drying for 5–7 days, repotting in dry mineral substrate.
Mealybugs: the most common indoor pest. White, cottony clusters at the base of leaves and in spine crevices. Treatment: cotton swab dipped in 70% rubbing alcohol for light infestations; neem oil or insecticidal soap for heavy infestations.
Spider mites: common in warm, dry indoor air (winter heating season). Leaves develop a stippled, bronzed appearance and may show fine webbing. Treatment: rinse with a strong water spray, apply neem oil, increase ambient humidity.
Root mealybugs: invisible above ground; detected when repotting (white cottony masses on roots). Treatment: rinse roots, soak in systemic insecticide solution, repot in fresh substrate.
Etiolation: a non-infectious physiological disorder caused by insufficient light. The trunk becomes abnormally thin at the top, leaves are pale and floppy, spines are shortened. Treatment: move to a brighter location. The deformation is permanent on the etiolated section, but subsequent growth will be compact if light is adequate.
For detailed treatment protocols, see our guide: Pachypodium pests and diseases: diagnosis and treatment.
Landscape and design use
Container plant on a patio or balcony: the primary use in temperate climates. The architectural silhouette of Pachypodium lamerei makes a striking specimen in a terracotta pot on a sunny patio, alongside agaves, yuccas, and columnar cacti. It blends naturally into Mediterranean or exotic-themed garden designs.
Indoor specimen: a vertical plant with a small footprint, ideal for bright but narrow spaces (entryways, conservatories, south-facing hallways). Slow indoor growth — 2–3 in (5–8 cm)/year in moderate light — means it can remain in the same spot for years.
In-ground under frost-free cover: feasible only in unheated but frost-free greenhouses or sheltered structures in USDA zones 9b–10 (sheltered coastal Mediterranean areas). Under these conditions, specimens develop far more imposing trunks than pot-grown plants and can reach 10–13 ft (3–4 m).
Outdoor in the ground (frost-free zones): in regions with mild, dry winters (Canary Islands, southern Portugal, parts of southern Italy, Southern California, southern Florida), Pachypodium lamerei can be grown permanently outdoors in very well-drained soil with protection from prolonged winter rain.
Safety note: the spines are sharp and hooked — avoid placing the plant along frequently used walkways, near children’s play areas, or at face height on a windowsill.
Frequently asked questions
My Pachypodium lamerei is losing its leaves in winter. Is it dying?
No. Leaf drop between October and February is a natural, genetically programmed dormancy behavior. Squeeze the trunk: if it is firm, the plant is perfectly fine. Stop watering, keep it in bright light, and wait for spring. New leaves will appear in March–April. For a comprehensive diagnosis of all leaf-drop causes, see: My Pachypodium is losing its leaves: causes, decision tree, and solutions.
Is Pachypodium lamerei toxic?
The clear sap is irritant to skin and mucous membranes but is markedly less dangerous than the sap of Adenium (which contains cardiac glycosides). The primary risk is mechanical: the spines are rigid, sharp, and hooked, capable of puncturing thick gardening gloves. Wear gloves and wrap the trunk in newspaper for any handling.
What is the difference between Pachypodium lamerei and Pachypodium geayi?
The most reliable criterion is the underside of the leaves: glabrous (smooth) in Pachypodium lamerei, pubescent (downy) in Pachypodium geayi. The spines are dark brown in Pachypodium lamerei, pale grey in Pachypodium geayi. Cultivation requirements are identical. See our comparison guide: Pachypodium lamerei vs. Pachypodium geayi: how to tell them apart.
Will it bloom indoors?
It is unlikely under standard apartment conditions. Flowering requires a mature plant (at least 3 ft / 1 m, usually 5–10 years old), at least 6–8 hours of full direct sun per day during the growing season, and a cool, bright winter dormancy. By combining outdoor summers with overwintering in a cool, bright conservatory, flowering becomes possible after several years.
Can I prune a Pachypodium lamerei to control its height?
Yes. Cut the top of the trunk with a sterile tool and let the wound callous. The trunk will produce one or more branches below the cut, creating a multi-headed form that many growers find more attractive than the single-stemmed original. The removed top can be used as a cutting.
How fast does Pachypodium lamerei grow?
It is the fastest species in the genus. Expect 6–12 in (15–30 cm)/year under optimal conditions (full sun, warm temperatures, proper watering). Indoors with moderate light, growth slows to 2–3 in (5–8 cm)/year. Plants summered outdoors grow noticeably faster than those kept indoors year-round.
Bibliography
Eggli, U. & Nyffeler, R. (2009). “Living under temporarily arid conditions — succulence as an adaptive strategy.” Bradleya, 27: 13–36.
Lüthy, J.M. (2004). “Pachypodium — Notes on the taxonomy.” Cactus and Succulent Journal, 76(3): 126–131.
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. 107 pp.
Rowley, G.D. (1999). “Pachypodium and Adenium.” Cactus File Handbook, 5. Cirio Publishing, Southampton.
Rauh, W. (1995). Succulent and xerophytic plants of Madagascar, vol. 1. Strawberry Press, Mill Valley. 343 pp.
Drake del Castillo, E. (1899). “Note sur les plantes recueillies par M. Guillaume Grandidier dans le sud de Madagascar en 1898.” Bulletin du Muséum national d’histoire naturelle, 5: 304–307. [Original description of Pachypodium lamerei]
CITES (2024). Appendices I, II and III. Convention on International Trade in Endangered Species of Wild Fauna and Flora. https://cites.org/eng/app/appendices.php
POWO (2024). Pachypodium lamerei Drake. Plants of the World Online, Royal Botanic Gardens, Kew. https://powo.science.kew.org