Mammillaria geminispina

Mammillaria geminispina is a stunning and popular cactus, easily recognized by its dense covering of white radial spines that give it a frosty, fluffy look—and sharp, reddish central spines that peek through. Native to central Mexico, it often grows in clumps or small mounds and produces beautiful pink to magenta flowers in a circular crown.

Here’s how to care for it:

🌵 Mammillaria geminispina Care Guide

☀️ Light

• Loves bright, indirect light to full sun.

• Indoors: Best in a south or east-facing window.

• Outdoors: Give it morning sun and light afternoon shade, especially in hot climates.

💧 Watering

• Water only when the soil is completely dry.

• In spring/summer: every 10–14 days, depending on heat and humidity.

• In winter: Reduce to once a month or less—keep almost dry.

🌱 Soil

• Use a gritty, well-draining cactus mix.

• Add extra cinder, perlite, coarse sand, or pumice to improve airflow and prevent rot.

🌡️ Temperature

• Prefers temps between 70–85°F (21–29°C).

• Hardy down to about 40°F (4°C) if dry.

• Not frost-tolerant—bring indoors if you’re in a cold zone.

🍽️ Fertilizer

• Feed monthly during spring and summer with a diluted cactus fertilizer.

• Do not fertilize in winter.

🪴 Growth & Repotting

• Forms tight clusters over time.

• Repot every 2–3 years, ideally in spring.

• Use gloves—it has sneaky central spines!

🌸 Flowering

• Produces small pink or magenta flowers in a crown-like ring.

• Needs plenty of light and good care to bloom.