Overwintering guide
How to overwinter moonlight cactus
Winter watering
Cut watering right back — moonlight cactus uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
The mistake that kills moonlight cactus in winter
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and moonlight cactus rots from the base.
More moonlight cactus care
Overwintering moonlight cactus — FAQ
Does moonlight cactus need to come indoors for winter?
Moonlight Cactus is hardy to roughly USDA zone 10 — winter lows around -1°C. That means it will not survive frost and needs to come inside. Moonlight Cactus is frost-tender, so overwintering means bringing it inside and letting it rest rather than pushing it to grow. Move it indoors well before the first frost, give it the brightest spot you have (light levels indoors drop sharply in winter), and keep it away from both cold window glass and hot radiators — the swing between the two does more damage than the cold itself.
When should I move moonlight cactus for winter?
Bring indoors when nights start dropping below about 10°C, ahead of the first frost.
How often should I water moonlight cactus in winter?
Cut watering right back — moonlight cactus uses far less while growth slows, and cold, wet compost is the usual cause of winter root rot. Stop feeding until spring.
What kills moonlight cactus over winter?
Watering on the same schedule as summer. In winter that keeps the roots sodden while the plant is barely drinking, and moonlight cactus rots from the base.