Opuntia megarrhiza

A rare, endangered dwarf prickly pear known from a few mountain-top populations in San Luis Potosí, Mexico. As the name suggests, it has a large swollen root. Grow it in full sun, keep it dry and cool in winter, and give a very fast-draining mix to protect the root from rot.

At home, aim for

Day Cool-growingTargets in Plantistry

Night A clear drop at nightTargets 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

Grassland and open scrub around mountain summits in the Sierra de Álvarez and La Trinidad ranges, among rocks in shallow soil.

Recorded from about 990 m to 2,240 m, with a median near 2,085 m.

Mexico Northeast (San Luis Potosí)

🔒 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.