A Malvaceae giant of the dry forests of southwestern Madagascar, between Morombe and Lake Ihotry, and the largest of the genus. Trees reach 25–30 m with a cylindrical trunk up to 3 m across, wrapped in smooth reddish-grey bark and topped by a flat crown. These are the trees lined up along the famous Avenue of the Baobabs near Morondava — one of Madagascar's emblematic landscapes. White flowers open in the dry season from May to August. Seedlings thicken at the base early on, making this a caudex plant to grow over the long term. It is listed as Endangered by the IUCN and on CITES Appendix II.
Native climate
Rain concentrates in the warm season, with a dry season of roughly 5 months. Overall a warm climate.
A broad-scale picture of the native range. Real growing spots — rock crevices, fog belts — can be milder.
Sources: climate & elevation WorldClim 2.1 (1970–2000) · occurrences GBIF · native range POWO · current weather Open-Meteo
Care
Light & Placement
Raised in open dry forest in southwestern Madagascar under strong sun, it wants bright light and air movement. In active growth give it full sun outdoors — the trunk stays tight, the petioles short, and the heavy-based form holds together. Through Japan's high-humidity midsummer it can scorch lightly or stew, so light shading at around 30%, with the pot raised on a bench for airflow, is the safer setting. After leaf-drop — its dry-season dormancy — move it early to a bright indoor window kept above 8°C, and don't leave young plants outside.
Watering
In active growth, water thoroughly once the surface dries; alternating wet and dry plumps the trunk. Don't leave water in the saucer. After leaf-drop, hold essentially dry through dormancy with at most a monthly misting.
Substrate
Drainage first, inorganic-led. Akadama : Kanuma : pumice = 4:3:3. It drives a deep taproot, so a tall pot keeps the wet–dry cycle clean and the swollen base healthy.
Fertilizer & Supplements
A diluted liquid feed once or twice a month in active growth, or a pinch of slow-release at repotting. Growth is brisk, so the base thickens well even on a modest dose.
Temperature & Overwintering
Active growth runs 24–34°C; aim for an 8°C minimum. In habitat mature trees tolerate dry-season chill, but seedlings are far more cold-tender. Bring it under cover early in autumn and overwinter dry on a bright indoor window.
Starting from Seed
Where to source seeds
links go directly to the product page; the rest are scientific-name searches. Stock fluctuates — verify availability on the destination site.
Pre-sowing treatment
The seed coat is thick and hard, so soaking for half a day to overnight in warm water around 40–50°C to draw up moisture gives more even germination. Pairing it with a registered fungicide (Benlate or Daconil) at label dilution is a safe step. Seeds that float rather than sink are more likely past their freshness.
Substrate
A fine-grained, near-sterile seedling mix: fine Akadama, fine Kanuma, vermiculite in 1:1:1 parts. Sterilize with boiling water or a microwave pass to reduce damping-off.
Sowing method
The seeds are large, so a thin covering of about half the seed thickness is enough. Space at least 1 cm apart to avoid crowding.
Light & temperature
Bright shade at a steady 28–32°C. Expect germination in 7–21 days. It depends on freshness, but with the coat pre-treated and the seed fresh, germination is reasonably steady.
Watering
Bottom-water with the level 1–2 cm up the pot. For the first 2–3 weeks, don't let things dry out, then drop the level gradually as seedlings come up.
Fertilizer
No feeding right after germination. Once true leaves emerge, give a heavily diluted liquid fertilizer once or twice a month — growth is brisk without pushing the dose.
From Germination to Repotting
Germination through true leaves
Continue bottom watering, avoid strong light.
Weaning off bottom watering
Transition gradually over 1–2 months.
First repotting
Into a tall pot in the first year, as the taproot fills out.
Common Pitfalls
Mold & damping-off
- Cause: excess moisture, contamination, poor air flow
- Prevention: sterilize substrate, change bottom water frequently, keep air moving
Etiolation
- Cause: insufficient light, heat-and-humidity stress
- Prevention: bring LEDs closer right after germination, or move to bright shade outdoors
Seeds fail to germinate
- Cause: stale seed, coat not imbibed, insufficient warmth
- Prevention: pre-soak fresh seed in warm water before sowing; hold 28–32°C on a heat mat
Notes
The taproot is thick and fast, so pot up early to avoid root-binding.
