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Mammillaria Hahniana

Mammillaria hahniana

succulent

verifiedReviewed by the GreenScout Team

Often called the Old Lady Cactus, this charming mammillaria features fine white hair-like spines covering a small spherical body (2–3 inches diameter). It produces delicate pink or magenta flowers in a crown around the top. An excellent small specimen for containers and collections.

Common Problems

Select the problem your Mammillaria Hahniana is experiencing to get a treatment guide.

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Root Rotchevron_right

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Overwateringchevron_right

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Mushy Stemschevron_right

Care Guide

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Light

Bright light with 4–6 hours of sun daily. Filtered sun in very hot climates prevents scorching.

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Water

Water moderately during growing season (spring/summer) when soil is dry. Reduce water sharply in winter; water sparingly or not at all.

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Soil

Fast-draining cactus potting mix with extra perlite or coarse sand.

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Fertiliser

Fertilize diluted monthly during the growing season only. Skip fertilizing in winter.

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Temperature

Tolerates 50–75°F; prefers cooler, dry winters (45–50°F) to encourage blooming.

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Humidity

Very low humidity (below 40%). High moisture promotes rot.

Toxicity

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Non-toxic but fine spines are irritating if handled carelessly.

Common Diseases

filter_dramaRoot Rotchevron_right

Common Pests

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Seasonal Care

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Resume regular watering and feeding as growth picks up.

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Peak growing season. Water and feed regularly.

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Reduce watering as growth slows. Stop heavy feeding.

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Minimal watering and feeding. Protect from frost if needed.

Frequently Asked Questions

Why is Mammillaria Hahniana called Old Lady Cactus?

Fine white hair-like spines cover its small spherical body, giving it a soft, whiskery appearance that inspired the common name.

How do I get my Mammillaria Hahniana to bloom?

Give it cooler, dry winters (45–50°F) to encourage blooming — it then produces delicate pink or magenta flowers in a crown around the top of the plant.