Calvatia horrida
A spiny-surfaced arctic puffball described by Morten Lange, with GBIF records only from Svalbard. It fruits on tundra soil in a very short, cold summer and is not cultivated.
At home, aim for
Day
Cool-growingTargets in Plantistry
Night
Close to the dayTargets in Plantistry
Humidity
Very humid airBand in Plantistry
Light
Full sunDLI and PPFD in Plantistry
Expects a seasonal rest
Where it grows wild
High-arctic tundra soil around Longyearbyen, Svalbard, in open, exposed ground.
Few records carry an elevation; none can be given.
Svalbard
🔒 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 Calvatia
Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app.