Pachypodiums: The Ultimate Caudiciform Collector's Guide

With their swollen, sculptural trunks (caudices), fierce spines, and star-shaped flowers, Pachypodiums are the crown jewels of succulent collections. Native to Madagascar and southern Africa, these "thick-footed" plants (the name means exactly that) range from towering trees to button-sized miniatures. Here's how to grow them—and which species to seek out.

Core Culture: What All Pachypodiums Need

• Light: Full sun outdoors; brightest possible window indoors (southwest ideal). Rotate pots to prevent leaning.
• Soil: Extremely fast-draining. Mix pumice, perlite, or scoria with coarse sand and a small amount of organic matter (e.g., 40% pumice, 40% organic, 20% coarse sand).
• Water: Summer growers. Water generously in active growth (spring–fall). Stop or drastically reduce in winter when deciduous species drop leaves. Rainwater is fine in winter; tap water risks rot.
• Temperature: Heat lovers. Most tolerate brief dips to 28°F (–2°C); 26°F (–3°C) causes caudex damage. Frost-damaged plants: move to warmth, dust wounds with rooting hormone, withhold water for weeks.
• Fertilizer: Light, balanced feed in summer if not repotting annually. Extra potassium in late summer may boost cold hardiness.
• Pots: Heavy, wide-based containers—water-filled trunks make them top-heavy. Crested forms especially need stability.

Species Spotlight: The Most Cultivated

Pachypodium lamerei – Madagascar Palm (Most Common)

• Fastest, easiest, most widely grown. To 20 ft in habitat; 6–10 ft in pots.
• Spines in groups of three: two long, one short, jutting outward.
• Leaves lanceolate, bright green with pale yellow midrib.
• White, fragrant flowers with yellow centers in early summer.
• Tolerates humid climates (Florida) better than most.
• Crested forms common but may be shorter-lived.

Pachypodium geayi – Madagascar Palm (Arid Form)

• Similar size to lamerei but beefier, greyer-green leaves with reddish midrib.
• Spines in threes, equal length, pointing at sharp angles from trunk.
• Prefers drier heat; slower to flower.
• Equally hardy and fast-growing.

Pachypodium rutenbergianum – Giant Madagascar Palm

• Largest species: to 30 ft in Madagascar.
• Slender trunk, narrow recurved leaves with white midrib.
• Paired short spines like rose thorns.
• Deciduous even in tropics; flowers in winter on bare stems.
• Less cold-hardy; best in frost-free zones or against warm walls.

Pachypodium namaquanum – Halfmens (Southern Africa)

• Iconic "half-man" silhouette: thick, columnar, rarely branched.
• Pale green, fuzzy leaves with wavy margins.
• Deep red flowers in tight terminal clusters.
• Slow-growing; 3–4 ft typical in cultivation.
• Rot-prone if winter-wet; needs sharp drainage and full sun.

Pachypodium saundersii (syn. lealii var. saundersii) – Star of Lundi

• Highly branched, irregular shrub to 4 ft.
• Smooth, shiny bright green leaves with white midrib along stems.
• Paired spines; white flowers late summer–fall.
• Easy but "sloppy" habit; prune for shape.
• Cold-hardy to just below freezing.

Pachypodium lealii (var. lealii)

• Similar to saundersii but leaves less shiny, almost fuzzy.
• Spines in threes (two long, one short) perpendicular to stem.
• Pink-throated tubular flowers in early–mid summer.
• Hardy to ~26°F.

Pachypodium succulentum – Geophytic Caudex

• Massive underground caudex in nature; grown exposed in cultivation.
• Twisted, soft branches with fine paired spines.
• Small, curled leaves at branch tips; tiny white flowers with pink midribs (late spring).
• Among the hardiest for marginal climates.

Pachypodium bispinosum

• Similar to succulentum but with massive above-ground caudex, less twisted.
• Wider leaves; larger funnel-shaped pink-throated flowers.
• Hardiness likely comparable.

Pachypodium densiflorum

• Ornamental, smooth, tapering caudex with short upright branches.
• Soft, fuzzy, paddle-shaped leaves; paired short spines that shed on old wood.
• Large golden flowers on tall stalks (late summer–fall).
• Recovers well from freeze damage.

Pachypodium rosulatum & Allies

• Compact (to 2 ft), shiny dark green leaves, bright yellow flowers on short stalks.
• Includes P. cactipes (often synonymous) and several varieties.

Pachypodium horombense

• Low, fat caudex tapering elegantly to branches.
• Teardrop leaves with prominent white midrib.
• Large, brilliant yellow flowers.

Pachypodium brevicaule – The "Molten Silver" Button

• Ultra-dwarf: rarely exceeds 2" height.
• Short teardrop leaves; variable spines (sometimes nearly spineless).
• Bright yellow flowers on short peduncles.
• Touchy: demands stable temperatures, consistent moisture (never bone-dry, never soggy). Not cold-hardy.

Pachypodium baronii

• Nearly spineless; paired spines tiny and smoothing with age.
• Bottle-shaped trunk to 3 ft; brilliant red spring flowers.
• Frost-tender; greenhouse or warm indoor only.

Rare & Emerging Species

About 10–15 additional species (P. eburneum, P. makayense, P. mikea, P. decaryi, etc.) are entering cultivation via specialist nurseries and society shows. All are ornamental caudiciforms worth the hunt for serious collectors.

Quick Troubleshooting

Symptom	Likely Cause	Action
Soft, mushy caudex	Overwatering / poor drainage / winter water	Stop watering, improve drainage, apply rooting hormone to wounds
Etoliated, leaning growth	Insufficient light	Move to full sun / brighter window; rotate regularly
Blackened tips after frost	Freeze damage	Move to warmth, dust with rooting hormone, keep dry for weeks
Yellow spotting on oldest leaves	Potassium deficiency	Apply potassium sulfate; do NOT prune affected leaves

Editor's Note: Originally published March 25, 2008. Photos by the author and DG members (Hellobebe, Floridian, MichaelCharters, IslandJim, RUK, RWhiz, KaraAnn, RWhis, IslalndJim).