A truly singular gymnosperm endemic to the Namib Desert, known in Japanese as kisoutengai (奇想天外, "beyond imagination") and sabaku-omoto. Described by Hook.f. in 1862, the genus honours the Austrian botanist Friedrich Welwitsch and the epithet mirabilis simply means "wonderful." Both family (Welwitschiaceae) and genus are monotypic — this single species sits in its own family within Gnetales, with Ephedra and Gnetum as its closest living relatives. From a half-buried woody crown emerge just two strap-shaped leaves that grow continuously for the plant's entire life, reaching 2–4 m, while the plant itself can live well beyond 1,500 years (some individuals are estimated at 2,000+). A "living fossil," and CITES Appendix II-listed.
Native climate
Rain concentrates in the warm season, with a dry season of roughly 9 months. 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
In the coastal fog desert of Namibia, this species grows under fierce direct sun moderated by maritime fog. Give it full sun outdoors during the growing season — strong light keeps the leaf tone tight and the form compact. Through Japan's midsummer, light shading at 30–40% with raised airflow helps prevent stagnant humidity and tip burn. The plant dislikes still humid air, so keep the pot off the ground on a bench. Overwinter on a bright window kept above 5°C, on the dry side. The leaves are evergreen and persist year-round.
Watering
Mimicking the desert fog, water thoroughly to the bottom of the pot once the surface dries during active growth. Empty the saucer. Through winter, drop to once or twice a month — never bone-dry, as the leaves should stay turgid.
Substrate
Drainage and depth come first, fully inorganic. Akadama : pumice : Kanuma = 4:4:2. The taproot grows astonishingly long and deep, so a deep pot is mandatory — long pots or orchid pots are ideal.
Fertilizer & Supplements
A dilute liquid feed once a month in active growth, or a pinch of slow-release at repotting. Don't push the leaf elongation; aim for slow caudex thickening with a light hand on nutrients.
Temperature & Overwintering
Optimal 22–35°C, 5°C minimum. Coastal Namib has a small annual range with winter nights around 10°C. Bone-dry plants tolerate brief cold, but damp soil under cool temperatures invites root rot. Overwinter dry on a bright 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
Seeds carry a papery wing that's notorious for harbouring Aspergillus niger spores — strip the wing first. 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.
Substrate
Fully inorganic seedling mix is safest: fine Akadama, fine pumice, fine Kanuma in 4:4:2, or straight Kanuma. Sterilize with boiling water or a microwave pass, and use a deep pot from the start to accommodate the rapidly descending taproot.
Sowing method
Sow directly into a near-final deep pot from the very beginning. The taproot can lengthen to nearly 20 cm in a month and is fatal to damage by transplanting. Cover with about 1 cm of substrate.
Light & temperature
Bright shade at a steady 25–30°C. Expect germination in 7–21 days. Germination depends on seed freshness, but with fresh seed it is reasonably steady. A heat mat helps hold temperature steady.
Watering
Bottom-water with the level 1–2 cm up the pot to maintain humidity. Once seedlings come up, raise the water level then switch to top-watering when the surface dries.
Fertilizer
No feeding right after germination. Once true leaves start moving, give heavily diluted liquid fertilizer once or twice a month, kept very light.
From Germination to Repotting
Germination through true leaves
Two cotyledons plus two true leaves for life.
Weaning off bottom watering
Gradually over 1–2 months post-germination.
First repotting
Avoid if at all possible. Sow deep from day one.
Common Pitfalls
Mold & damping-off
- Cause: Aspergillus niger on seed coats, excess moisture
- Prevention: strip wings, sterilize, inorganic substrate, strong airflow
Etiolation
- Cause: a tricky concept for a plant whose two leaves are it for life
- Prevention: if leaves grow thin and overly stretched, raise light levels and add airflow
Seeds fail to germinate
- Cause: stale seed, insufficient warmth
- Prevention: fresh wild-collected seed, 25–30°C steady on a heat mat
Notes
Damaging the taproot during transplanting is fatal — sow into a deep pot from the start and avoid moving it. Listed on CITES Appendix II; international trade in live plants requires permits.
