Mammillaria elongata

A clustering 'ladyfinger' cactus from the dry highlands of central Mexico, forming mats of finger-thick stems with small cream to pale-yellow flowers from late winter to early summer. It wants strong light, a dry and cool winter, and a fast-draining mineral mix; overwatering is the usual way it is lost.

At home, aim for

Day Cool-growingTargets in Plantistry

Night A clear drop at nightTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Bright, filtered lightDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

Grows among rocks, in crevices and on stony slopes in semi-arid scrub of the central Mexican highlands, often partly shaded by rocks or shrubs.

Records span 30–2426 m, with a median of 1730 m, so most plants grow in cool-night upland scrub.

HidalgoQuerétaroGuanajuatoMexico GulfMexico Northeast

🔒 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.