A small Araliaceae tree described by Eckl. & Zeyh. in 1837, ranging across the South African Highveld grasslands from Eastern Cape through KwaZulu-Natal and Free State into Gauteng, with extensions into Botswana, Lesotho and Eswatini. Known in English as the Mountain cabbage tree (also Highveld cabbage tree) and as Kiepersol in Afrikaans, it carries a stout pale-grey trunk topped by an unmistakable umbrella of bipinnate, blue-green compound leaves. It is the most drought- and cold-tolerant member of the genus, prized as both a caudex plant and an ornamental tree, and grows quickly enough from seed to make it a friendly entry point for caudex collectors.
Native climate
Rainfall is spread fairly evenly across the year. Overall mild, with a wide temperature range.
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 the South African Highveld up to 2,100 m elevation, where it stands fully exposed to strong sun and dry wind on rocky grassland. Outdoors during the growing season, full sun produces a tight trunk, short petioles, and the crisp blue-green leaf tone the species is loved for. In Japan's hottest months, light shading at 20–30% reduces leaf scorch and humidity stress; raise the pot off the ground onto a bench for airflow. The plant goes deciduous and dormant in winter — bring it to a bright, rain-free indoor window and overwinter dry.
Watering
In active growth, water thoroughly once the surface has dried — the wet–dry rhythm builds out the trunk and underground rootstock. After leaf-drop, hold it essentially dry through dormancy, with at most a monthly misting.
Substrate
Drainage and aeration first, inorganic-led. Akadama : Kanuma : pumice = 4:3:3. Use a deep pot — the rootstock pushes downward and benefits from generous depth.
Fertilizer & Supplements
A diluted liquid feed once or twice a month in active growth, or a pinch of slow-release at repotting. Overfeeding lengthens petioles; keep it modest and let the trunk thicken slowly.
Temperature & Overwintering
Active growth runs 22–32°C; aim for a 5°C minimum. The most cold-tolerant species in the genus — light frosts are reported in habitat — but wet substrate plus cold is fatal. After leaf-drop, overwinter dry on a bright indoor window.
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 past their prime. The fruit pulp contains germination inhibitors, so wash it off completely and sow soon after receipt.
Substrate
A fine-grained, near-sterile seedling mix: fine Akadama, fine Kanuma, vermiculite in 1:1:1 parts. Use a tray at least 15 cm deep so the rootstock has room to push down.
Sowing method
Seeds are mid-sized — press lightly into the surface with the seed barely visible through the substrate. Space at 1–2 cm and avoid crowding.
Light & temperature
Bright shade or under LEDs at a steady 22–28°C. Expect germination in two to four weeks. Germination depends on seed freshness, but with fresh seed it is reasonably steady; cooler conditions can stretch this to about seven weeks.
Watering
Bottom-water with the level 1–2 cm up the pot. For the first 2–3 weeks don't let things dry, 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 — well below the label 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
In year one or two, once the deep roots have circled.
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: use fresh seed under three months old, hold 22–28°C on a heat mat
Notes
Avoid wet substrate combined with cold winter temperatures.
