How to care for mammillaria

Mammillaria · Pincushion cactus

Mammillaria (Mammillaria) — a large genus of small cacti with globular or short cylindrical stems, often clustering, covered in spirally arranged tubercles tipped with spines or wool; small funnel-shaped flowers form a ring around the top of the stem. Mammillaria needs full sun and 21–27 °C. Water it about every 14 days while it grows and about every 30 days in the winter rest.

Checked against sources: November 5, 2026

Watering and repotting mammillaria through the year

It lives indoors all year, so it has no sowing or planting dates: it grows from March to September and rests from October to February (the other way round in the southern hemisphere).

Repot it about every 36 months.

When to plant mammillaria?

Plant or repot mammillaria in spring, as it starts into growth; early to midsummer also works. It is a houseplant, so it has no outdoor planting date and no frost decides it: just avoid autumn and winter, when growth slows and fresh compost stays wet too long. After that, move it to a slightly larger pot about every three years, or sooner once roots circle the pot or grow through the drainage holes.

Watering in the growing and resting halves of the year: Watering and repotting mammillaria through the year.

Sources: RHS: How to repot a plant · Penn State Extension: Repotting houseplants

Quick facts

Type	Houseplant
Latin name	Mammillaria
Family	Cactaceae
Also called	Pincushion cactus
Light	Full sun
Frost	does not tolerate frost
Repotting	every 36 months
Grown in	At home

Where does mammillaria grow?

40,966 records of the plant in gardens, fields and the wild worldwide; most photos come from Mexico, United States, Dominican Republic, Cuba, and Antigua & Barbuda.

World map: where mammillaria has been recorded — Darker green means more records. Photos are real observations from those countries — tap one to see it. Map and records: GBIF.org (2026-10-28), © OpenMapTiles © OpenStreetMap. Photo: Zuriel Ruiz Vázquez, Yolanda M. Leon, -1376491962, Naelin (CC BY / CC0).

Mammillaria, Mexico — Darker green means more records. Photos are real observations from those countries — tap one to see it. Map and records: GBIF.org (2026-10-28), © OpenMapTiles © OpenStreetMap. Photo: Zuriel Ruiz Vázquez, Yolanda M. Leon, -1376491962, Naelin (CC BY / CC0).

Mammillaria care by growth stage

At home

Stage	Watering	Temperature	Feeding
Growth	every 14 days	21…27 °C	potassium, 14 days into the stage; potassium, 44 days into the stage; potassium, 74 days into the stage; potassium, 104 days into the stage; potassium, 134 days into the stage; potassium, 164 days into the stage
Winter rest	every 30 days	7…13 °C	—

Growing notes

Light

Full sun or very bright light, such as a sunny south- or west-facing windowsill, with a little afternoon shade in hot weather. When moving it outdoors for summer, give it a couple of weeks in partial sun first or it scorches.

Soil

Free-draining cactus compost with extra grit or coarse sand, in a pot with drainage holes; avoid a pot much bigger than the plant, as the extra compost stays wet.

Care

From spring to early autumn water thoroughly once the top 2–3 cm of compost is dry, let it drain and never leave the pot standing in water; overwatering causes rot. Tepid rainwater is best. Feed once a month from April to September with a high-potassium or cactus feed. From November to early March give it a cool rest at about 7–13 °C with little or no water; this rest is what makes it flower in spring. It flowers more freely when slightly pot-bound, so repot only every few years, in spring, holding it with a folded strip of newspaper because the spines are sharp. Watch for mealybugs, spider mites and scale.

Pests and diseases of Mammillaria

2 problems are recorded for mammillaria; each has a page with symptoms, treatment and prevention.

Pests

Other plants of the Cactaceae family

Mammillaria belongs to Cactaceae; 6 other plants of this family have a guide here.

Plant lists it is in

What to grow on a windowsill or balcony

Part of: Houseplants · Flowering houseplants · Houseplants for a sunny window · Houseplants that need little water

Sources

Figures checked against these sources.