Asplenium compressum

A robust spleenwort endemic to St Helena in the South Atlantic, with thick, somewhat fleshy fronds. It belongs to the island's cloud-forest remnants on the high central ridge, where it is now very rare. Grow it as a mild, frost-free fern in constantly moist, misty air.

At home, aim for

Day IntermediateTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Humid airBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

No rest periodGrows in the ground

Where it grows wild

It grows in the remnant cloud forest and tree-fern thicket of St Helena's central ridge, on moist ground, banks and mossy trunks. The ridge is often in cloud, and trade-wind mist keeps it much wetter than the coast.

The central ridge rises to about 820 m (Diana's Peak). The measured grid point is at 641 m.

St Helena

🔒 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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More Asplenium

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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.