Old Lady Cactus (Mammillaria crinita)

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Sunlight Full sun to bright indirect light; blooms best in full sun, with partial shade protection from intense midday summer sun

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Watering Allow soil to dry completely between waterings; avoid overwatering to prevent root rot

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Temperature Thrives at 18–30°C; tolerates brief light frost down to 5°C when soil is dry

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Leaf: Modified into 20–30 fine white radial spines per areole, plus shorter central spines, creating a fuzzy woolly coating
Flower: Small funnel-shaped blooms in pale pink to white, forming a ring around the stem apex
Stem: Globular to cylindrical green stems covered in raised tubercles with woolly areoles

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Watering

Water thoroughly when soil is fully dry, every 7–10 days

Fertilization

Diluted cactus fertilizer once monthly. Do not fertilize during winter dormancy to avoid stressing the plant

Eggshell powder topdress：Crush dried eggshells into fine powder; sprinkle a thin layer on soil surface and water gently to incorporate solids

Pruning

Remove dead, shriveled offsets to maintain a tidy clumping habit
Use sterile tweezers to trim damaged or discolored spines carefully
Separate overcrowded offsets during spring repotting to promote individual growth

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirmed non-toxic to cats

Humans: No known toxic effects for humans

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Culture: Symbolizes resilience and quiet beauty in arid environments

Usage: Ornamental succulent for cactus collections, rock gardens, and sunny indoor displays