Pincushion Cactus (Mammillaria)
Pincushions form a group of about 200 species of ball-shape cacti that are among the most common cacti grown in the home. Most hail from Mexico, where they grow in full sun. Pincushion cacti can remain small and may take the form of single balls or clumps, often flowering indoors.
Be careful: The spines look delicate but have hooked ends that are difficult to pull out of skin.
To grow a pincushion cactus, provide the highest light possible. Allow the soil to dry out almost completely between waterings, and withhold water entirely in the winter to give it a cool, dormant period needed for flowering. Fertilize three times in summer only, using a balanced 10-10-10 fertilizer.
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