Asplenium unisorum

Singlesorus island spleenwort

A tiny, critically endangered spleenwort known only from the Waiʻanae Range of Oʻahu, Hawaiʻi, where it grows on mesic forested ridge slopes at about 650–730 m. Plants are only a few centimetres tall, with glossy black stalks and narrow fronds of 8–30 cm. It is federally protected and not in general cultivation, so this profile describes the conditions it grows in rather than tested care.

Asplenium unisorum — Photo: David Eickhoff, CC BY 2.0, via Wikimedia Commons

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

No rest periodGrows in the ground

Where it grows wild

Mesic forest on north-facing ridge slopes in the Waiʻanae Mountains, among ʻōhiʻa (Metrosideros), koa, Melicope and Psychotria. Herbarium notes record it under degraded canopy with invasive Schinus and Passiflora, with scattered small populations and one colony of at least 600 plants.

About 650–730 m. Herbarium records give 705–732 m.

Hawaiian Islands (Oʻahu: Waiʻanae Range)

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 2.0 licence, unmodified.