Blechnum wattsii

The hard water fern of south-eastern Australia (now often placed in Parablechnum), a creeping terrestrial fern with dimorphic fronds and bronze-pink new growth. It colonises wet, shaded creek banks and gullies, takes cool winters and light frost, and must never dry out.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Ordinary room humidityBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Damp, shaded rainforest and wet sclerophyll forest, especially along creeks, rivers and waterfalls, spreading by branched creeping rhizomes into colonies.

Records span 5–1500 m (median about 620 m); in Tasmania from sea level to about 1000 m.

VictoriaTasmaniaNew South WalesQueenslandSouth Australia

🔒 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 CC0 licence, unmodified.