Thelocactus bicolor

A widespread Chihuahuan Desert cactus with striking two-toned spines and large magenta flowers, found from west Texas deep into northeastern Mexico. It is a full-sun plant of limestone gravels. It needs a bone-dry, cool winter and only modest summer water.

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows in the ground

Where it grows wild

Grows on open limestone hills, gravel flats and slopes in Chihuahuan desert scrub, often partly sheltered by low shrubs or grasses.

Mostly from 1000 to 2000 m (median about 1430 m), down to the lowlands of the Rio Grande valley.

Mexico NortheastTexas

🔒 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 2.5 licence, unmodified.