Blechnum opacum
A terrestrial hard fern of humid forest in New Caledonia and Vanuatu, from about 350 m to 2000 m. Treat it as a warm-temperate to subtropical forest fern: shade, steady moisture and high humidity.
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
Grows in the understory of humid and montane forest; generalised from related Blechnum.
Recorded at 350–2000 m, median 610 m.
New CaledoniaVanuatu
🔒 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 Blechnum
Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.