Blechnum obtusum

A small high-Andean hard fern from the páramo and upper montane forest of Colombia and western Venezuela. It needs cold nights near freezing, cool days and moist, acid, peaty soil; warm rooms are its main enemy.

At home, aim for

Day Cool-growingTargets 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

Recorded around 3,300 m in the Venezuelan Andes; at that height Blechnum species grow among páramo shrubs, on mossy banks and at forest edges. Detail is generalised from the genus and habitat.

The measured site is about 3,350 m; the species likely spans upper montane forest to páramo, roughly 2,800–3,800 m.

ColombiaVenezuela

🔒 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

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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.