Button Cactus (Epithelantha micromeris)

Button Cactus

Epithelantha micromeris

A miniature, globose cactus densely covered in white spines, resembling a tiny button in the desert. Miniature ornamental; other names: Ping-pong ball cactus.

Requires bright, direct sunlight to maintain dense spine growth and compact shape; can tolerate light afternoon shade in extreme heat.
0.5/week
Moderate
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Plant Needs

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Sunlight Requires bright, direct sunlight to maintain dense spine growth and compact shape; can tolerate light afternoon shade in extreme heat.
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Watering Extremely drought-tolerant. Water only when the soil is completely dry, and keep entirely dry during winter dormancy.
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Temperature Thrives in hot environments but requires a cool, dry winter dormancy period (5-10°C) to encourage spring blooming.
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Characteristics

  • Stem: Globose to slightly cylindrical, highly depressed at the apex, typically 1 to 5 cm in diameter, completely obscured by spines;
  • Spines: Densely covered in tiny, chalky-white radial spines (usually 20-40 per areole) that lie flat against the stem;
  • Flowers: Small, pale pink to whitish, 3-6 mm in diameter, emerging from the woolly apex of the plant;
  • Fruit: Small, bright red, club-shaped berries that protrude prominently from the white spines when ripe.
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Care Guide

Watering

Water thoroughly but infrequently, allowing the soil to dry out completely between waterings.

Fertilization

Apply a diluted, low-nitrogen fertilizer once at the beginning of the growing season.. Fertilization recommendations description

Banana Peel Tea:Soak dried banana peels in water for 24-48 hours. Dilute the liquid 1:1 with water and apply during the active growing season to support root health and flowering. Avoid using the solid peels on the soil surface to prevent fungal gnats and rot.
Pruning
  • Pruning is not required for this miniature cactus;
  • Gently remove dried, spent flowers or shriveled fruits from the apex using tweezers to maintain a clean appearance;
  • Avoid damaging the delicate woolly crown during cleaning.
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: Non-toxic per ASPCA guidelines for most Cactaceae. Spines are relatively soft but can cause mild mechanical irritation if chewed.

Humans: No known chemical toxicity; fruits are technically edible but extremely small. Spines may cause minor mechanical irritation.

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Garden Uses & Culture

Culture: Highly prized in Western cactus collecting communities for its perfect geometric symmetry and miniature size, often featured in specialized succulent exhibitions.

Usage: - Cultivated as a specimen plant in miniature succulent collections; - Ideal for small decorative pots and windowsill gardens.