Winter Dormancy on cactaceae
What's Happening
Cactus owners face a binary choice each winter based on their indoor environment capabilities: Route A (Dormancy) mimics natural desert winter with cool temperatures 7-13°C and complete dryness, allowing the plant to rest and reset flowering hormones. Route B (Active Growth) requires maintaining summer conditions with warmth 20-25°C and strong supplemental lighting, enabling year-round development but demanding more equipment. Many failures occur from 'in-between' conditions - warm but dark, or cool but humid.
How to Fix It
- 1
Assess your winter setup: Can you provide temperatures below 15°C? Can you provide grow lights? Choose accordingly
- 2
ROUTE A - Dormancy: Move to coolest room (7-13°C), stop all watering, ensure ventilation, check monthly, resume watering in spring when temps rise and new growth appears
- 3
ROUTE B - Active Growth: Maintain 20-25°C consistently, install full-spectrum LED lights 12-16 hours daily, water every 3-4 weeks when dry, fertilize lightly monthly with cactus formula
- 4
Avoid 'in-between zone': Warm temperatures (18-21°C) with insufficient light is the most dangerous combination
- 5
Track your choice: Mark calendar with strategy chosen and expected outcomes
- 6
Hybrid approach (intermediate): Keep cool but provide minimal light to prevent etiolation - only if temperatures remain below 15°C
How to Prevent It
Make a deliberate choice before winter arrives based on your available space and equipment. Do NOT attempt dormancy in warm rooms (will cause etiolation) or active growth in cool dark spaces (will cause rot). Match your strategy to your environment: unheated room = dormancy route; warm room with grow lights = active growth route.