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Flowering cactus care

Mammillaria

Thirsty’s starting schedule for Flowering cactus: about every 21 days. Check the soil and adjust it to your home.

Watering

Let the soil dry out completely, then water thoroughly so it drains through. In winter, while it rests, water only enough to keep it from shriveling, or not at all, and never let it stand in water. [1][2][3]

Light

Lots of light: a bright, sunny window, ideally south- or west-facing. Some shade on the hottest afternoons is fine. [1][2][3]

Humidity

Copes well with the dry air of most homes. [2][3]

Soil and potting

A fast-draining cactus mix, or potting soil mixed with an equal amount of coarse sand or grit. [1][2][3]

Sources

1. NC State Extension (Extension Gardener Plant Toolbox): Mammillaria (Pincushion Cactus)
2. University of Minnesota Extension: Cacti and succulents
3. Clemson Cooperative Extension, Home & Garden Information Center: Indoor Cacti

This page summarizes the sources above; follow them for the full picture. Light, pot, soil and season all change how fast a plant dries out, so check the soil before you water. Last reviewed October 9, 2026.