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Species library › Blechnum › Blechnum durum
Ferns Partly documented

Blechnum durum

A tough, leathery hard fern of the far south of New Zealand and its subantarctic islands, growing in salt-sprayed coastal scrub and among rocks. It needs a cool, constantly moist, oceanic climate with no heat; it is a plant for cold, wet gardens, not warm homes.

Blechnum durum
Photo: Matilda Smith, Public domain, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Humid airBand in Plantistry
Light Dappled lightDLI and PPFD in Plantistry
No rest periodGrows in the ground

Where it grows wild

Grows in coastal scrub, forest margins, rock crevices and tussock near the shore, often exposed to wind and salt spray. It can tolerate fairly open conditions under constant cloud.

Mostly near sea level (median 12 m), occasionally up to 800 m.

New ZealandStewart IslandChatham IslandsAuckland IslandsCampbell IslandAntipodes IslandsSnares 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. Photo from Wikimedia Commons, used under its Public domain licence, unmodified.