A cycad endemic to a tiny pocket of limestone hill country in Guangxi, China — centred on Debao County, with outlying populations in Napo, Baise and Funing (Yunnan). Described by Y.C. Zhong & C.J. Chen in 1997, this is a gymnosperm in the order Cycadales, family Cycadaceae, not a flowering plant, and its species epithet honours the type locality of Debao. The defining feature is its tripinnate (three-times-pinnate) frond — unique within the genus, where leaflets themselves branch into further pinnae, producing a 2–3 m glossy dark-green leaf often called "the most bizarre cycad in the world". Listed on CITES Appendix II and assessed Critically Endangered by the IUCN, wild numbers have collapsed under collection pressure — making it both a conservation priority and one of the most coveted cycads in cultivation.
Native climate
Rainfall is spread fairly evenly across the year. Overall a warm climate.
* Accurate distribution data is scarce for this species, so these values are taken from the climate near the approximate center of its native range instead.
Sources: climate & elevation WorldClim 2.1 (1970–2000) · occurrences GBIF · native range POWO · current weather Open-Meteo
Care
Light & Placement
In habitat at 700–1000 m on steep karst limestone slopes and ledges, the plant grows on bright forest margins under a mix of dappled and direct light. In active growth keep it outdoors where it gets good light, but the soft tripinnate fronds scorch easily under harsh sun and dry wind, so aim for 30–50% shading in Japan's midsummer with steady airflow. Too much shade lets the rachis stretch and weakens the branching architecture that is the species' main visual feature — sit it between strong and weak light. Crown humidity is the main rot risk, so raise the pot off the ground for airflow, and overwinter on a bright indoor window out of rain.
Watering
In active growth water deeply once the substrate has fully dried, never leaving water in the saucer. Misting suits this humidity-loving species. In winter water sparingly, perhaps once or twice a month.
Substrate
Drainage first, inorganic-led: Akadama : Kanuma : pumice = 3:3:4. Because it is a limestone-cliff plant, a small addition of dolomitic lime or crushed eggshell stabilises pH. Use a deep pot to let the root run down.
Fertilizer & Supplements
A diluted liquid feed once a month in active growth, or a small pinch of slow-release at repotting. Growth is slow; overfeeding does not bulk up the plant — it only stretches the fronds and blurs the branching.
Temperature & Overwintering
Optimal 22–32°C, minimum 5°C. From subtropical limestone hills, it is slightly less cold-tolerant than C. revoluta, but dry plants have tolerated short dips around 0°C in reports from California. Wet soil under cold is fatal — overwinter on the dry side at a bright indoor window.
Starting from Seed
Where to source seeds
Pre-sowing treatment
The red fleshy seed coat (sarcotesta) invites rot — soak briefly to soften and remove it before sowing. 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 usually old or infertile. Germination requires steady warmth of 25–32°C.
Substrate
Lean toward straight inorganic — pumice fines as the base, or fine Akadama with pumice at 1:2. The seed is large and the root runs thick, so always use a deep pot. Sterilise with boiling water or a microwave pass beforehand.
Sowing method
Lay the seed on its side — orientating the seam vertically distorts the emerging root. Cover thinly so the upper half of the seed remains visible.
Light & temperature
Bright shade with a steady 25–30°C; a heat mat is essentially required. Germination is uneven over 1–3 months — don't give up after three quiet months.
Watering
Bottom-water with the level 1–2 cm up the pot, refreshing often to keep rot risk down. Drop the level gradually as seedlings emerge.
Fertilizer
No feeding right after germination. Once the first pinnate leaf opens, give a heavily diluted liquid fertilizer once a month — growth is slow, so do not push the dose.
From Germination to Repotting
Germination through true leaves
Cotyledon first, then a simple pinnate leaf.
Weaning off bottom watering
Phase out over 3–6 months.
First repotting
In year two or three, into a deep pot.
Common Pitfalls
Mold & damping-off
- Cause: residual sarcotesta, excess moisture, contamination
- Prevention: clean off the fleshy coat completely, sterilise the substrate, refresh the bottom-water often, and run a circulation fan
Etiolation
- Cause: insufficient light
- Prevention: harden seedlings into bright shade or partial sun to bring out the tripinnate branching architecture — use high-output LEDs kept close if indoors
Seeds fail to germinate
- Cause: stale seed, insufficient warmth, giving up too early
- Prevention: source fresh seed, hold 25–30°C steady on a heat mat, and keep the tray for at least three months
Notes
CITES Appendix II and IUCN Critically Endangered — a top conservation priority, and live-plant trade is regulated. Only source from legal, reputable suppliers. The seeds are highly toxic; keep them out of reach of children and pets.
