Ganoderma tsugae

Hemlock varnish shelf

A lacquered, reishi-like polypore of eastern North America that grows on hemlock and other conifers rather than hardwoods. The fresh, soft margin is sometimes cooked, but the mature shelf is woody and used only for teas and extracts. It is grown like reishi, on conifer or hardwood sawdust and logs.

At home, aim for

Day Warm-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Very humid airBand in Plantistry

Light ShadeDLI and PPFD in Plantistry

Expects a seasonal rest

Where it grows wild

A wood-decay fungus on dead and dying hemlock (Tsuga) and other conifers, fruiting as annual shelves on stumps, logs and trunk bases in cool mixed forest.

Recorded from 50–882 m (median 576 m, only 11 records carry an elevation); common in the Appalachians and the Great Lakes region.

Eastern North America

🔒 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 CC BY-SA 3.0 licence, unmodified.