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Species library › Blechnum › Blechnum cyatheoides
Ferns Well documented

Blechnum cyatheoides

This name is used for the Hawaiian ʻamaʻu fern, better known as Sadleria cyatheoides, a small tree fern endemic to Hawaii. It is a pioneer of young lava flows and open wet forest, with red new fronds, and wants bright light, mild temperatures and steady moisture with sharp drainage.

At home, aim for
Day IntermediateTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Humid airBand in Plantistry
Light Bright, filtered lightDLI and PPFD in Plantistry
No rest periodGrows in the ground

Where it grows wild

ʻAmaʻu colonises young lava flows, open ʻōhiʻa woodland and wet forest margins, often in full sun on rock with little soil.

Records span 4–2195 m, median about 1070 m.

HawaiiMauiKauaiOahuMolokai

🔒 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

Grow Blechnum cyatheoides? Add it to a free garden and its full profile opens. Pro opens all 38,374 profiles in the library, plants and fungi.

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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.