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Species library › Blechnum › Blechnum nigrum
Ferns Partly documented

Blechnum nigrum

Blechnum nigrum, now often placed in Cranfillia, is a small, dark-fronded hard fern of very shady, damp forest gullies in New Zealand and the south-west Pacific. It wants deep shade, constant moisture and humid, cool to mild air; strong light bleaches and scorches the fronds.

At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Humid airBand in Plantistry
Light Deep shadeDLI and PPFD in Plantistry
No rest periodGrows in the ground

Where it grows wild

Grows on damp, dark banks, beside streams and in deep gullies under dense lowland and lower montane forest.

Mostly lowland to lower montane forest; exact limits not confirmed here.

New ZealandSouth-west Pacific islands

🔒 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.