Winter Care for Coral Cactus in Low-Light Michigan

Michigan resident needs winter care for coral cactus (Nov-Feb no sun, house 68-75°F). Tag says 65-85°F. Asks about heat lamp or supplemental light.

Solution

Desk lamp with fluorescent daylight bulb, 6-8 inches from plant, on timer for 14 hours daily. Maintains health all winter. Critical: avoid overwatering, never leave in water-filled drain tray (rots roots).