Described by Thunb. in 1780, this Araliaceae caudiciform tree is widely known by its English name "cabbage tree". Its range stretches across eastern and southern Africa, from South Africa northward through Mozambique, Zimbabwe, Tanzania and Zambia into southern Ethiopia, occurring along forest margins, in wooded grasslands, and on rocky slopes in mountain country. Reaching 6–15 m, it is among the largest in the genus: a stout pale-grey trunk gives way to thick branches that hold deep green, twice-palmate compound leaves arrayed in a distinctive umbrella-shaped crown. The flagship species of the genus, easily raised from seed, it has long been cultivated worldwide as an entry-level caudex tree.
Native climate
Rainfall is spread fairly evenly across the year. Overall a mild 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
Native to forest margins and grasslands across eastern and southern Africa, it grows in strong sun with steady airflow. Give it full direct light through the active season — the trunk tightens, petioles stay short, and the canopy holds its umbrella form. Through Japan's midsummer, light shading at around 30% with the pot raised on a bench helps avoid leaf burn and stagnant air. Bring it indoors early once it drops its leaves for winter, to a bright window kept above 5°C. Frost-sensitive: never leave outside through a cold snap.
Watering
In active growth, wait for the topsoil to dry, then water thoroughly to swell the trunk. Don't let water sit in the saucer. Through dormancy, withhold water entirely or give only a small monthly drink to keep it dry through winter.
Substrate
Drainage and aeration first, inorganic-led. Akadama : Kanuma : pumice = 4:3:3 as a baseline. A deeper pot helps keep wet/dry cycles distinct and protects the caudex.
Fertilizer & Supplements
Diluted liquid feed once or twice a month in the active season, or a pinch of slow-release at repotting. Growth is quick for a caudex, so a steady moderate dose visibly thickens the trunk.
Temperature & Overwintering
Optimal 22–32°C, 5°C minimum. Tolerates a light frost but will die back under sustained cold. Move indoors as the leaves drop and overwinter on a bright window kept dry.
Starting from Seed
Where to source seeds
Pre-sowing treatment
Soak seeds for about half a day (overnight) in a mix of a registered seed-treatment fungicide (Benlate or Daconil) and a plant tonic (Menedael; outside Japan, SUPERthrive or a chelated iron / seaweed extract works similarly), each diluted per label. Floaters are typically no longer viable. Storage conditions strongly affect viability, so sowing soon after receipt is the safer course.
Substrate
A fine-grained, near-sterile seedling mix: fine Akadama, fine Kanuma, vermiculite in 1:1:1 parts. A microwave or boiling-water pass beforehand is good insurance.
Sowing method
Sow with no covering, or only the thinnest dusting so seeds remain partly visible. Space at least 1 cm apart and avoid clumping.
Light & temperature
Bright shade or LED at 22–28°C. Expect germination in 14–30 days. Germination depends on seed freshness, but with fresh seed it is reasonably steady.
Watering
Bottom-water with the level 1–2 cm up the pot. For the first 2–3 weeks, don't let it dry; once germination is even, lower the water level in stages.
Fertilizer
No feeding right after germination. Once true leaves emerge, give heavily diluted liquid fertilizer once or twice a month. Growth is on the quicker side, so don't overdo the dose.
From Germination to Repotting
Germination through true leaves
Continue bottom watering, avoid strong light.
Weaning off bottom watering
Step down over one to two months.
First repotting
In year one or two, once root-bound.
Common Pitfalls
Mold & damping-off
- Cause: excess moisture, contamination, poor air flow
- Prevention: sterilize substrate, change bottom-water frequently
Etiolation
- Cause: insufficient light
- Prevention: bring LEDs closer right after germination, or move to bright shade outdoors
Seeds fail to germinate
- Cause: stale seed, insufficient warmth
- Prevention: fresh seed, heat mat to hold 22–28°C
Notes
Watch for frost and overwatering.
