Blechnum minus

The soft water fern of south-eastern Australia and New Zealand, often placed in Parablechnum. It grows in wet, often open ground (swamp margins, stream banks, and seepages) and wants cool conditions, constant moisture, and moderate light.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

No rest periodGrows in the ground

Where it grows wild

A terrestrial fern of swampy ground, stream banks, and wet gullies, often in open scrub or forest margins rather than deep forest. It is widespread in New Zealand and temperate south-eastern Australia.

Recorded 5–1,483 m, median 640 m (525 records).

New ZealandChatham IslandsTasmaniaVictoriaNew South WalesSouth AustraliaAustralian Capital TerritoryQueensland

🔒 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. Photo from Wikimedia Commons, used under its CC BY-SA 3.0 licence, unmodified.