Mammillaria elongata Rotting at Base: Re-rooting in Proper Soil

Golden Star Cactus: Upper Parts Alive, Roots Dead

A 2-year-old Mammillaria elongata is dying at the root; upper stems look alive. Dead parts removed; some root strands remain. Owner used regular potting soil, repotted this summer, never seen it bloom. Asks how to replant and winter care (Northeast US).

Problem: Regular Potting Soil Holds Too Much Water

Greg advises: let the cleaned plant dry (callus) for at least 3 weeks. Then replant in cactus mix (not regular potting soil). Plant ~1 inch deep, water once, then only when soil is dry. Rooting may take 2 months. Always dry between waterings.

Winter Care (Northeast)

• Cool, bright window (south/west).
• Water once a month or less.
• No fertilizer until spring.
• Keep above freezing; 40°F minimum.

Proper soil and strict dry cycles are the key to Mammillaria survival.