Care Fundamentals
Summer survival for Lithops in tropical and subtropical climates
If your summer is hot, humid, and rainy, Lithops are at maximum risk. They are not unkeepable — but the conditions push every safety margin.
Why tropical summers are dangerous
Lithops summer dormancy evolved in dry heat. The body shuts down active growth and tolerates surface temperatures of 45 °C and more because the air is bone dry and night temperatures drop fast. In a humid tropical summer, neither happens — the air stays moist and nights stay warm. The body cannot transpire to cool itself, and the persistently warm-wet conditions invite fungal infection.
Six interventions that actually help
Move plants out of direct rain. A clear porch roof, a covered balcony, a greenhouse with the vents open — anywhere the substrate stays dry without losing light.
Switch to terracotta. The wicking through the walls knocks 2–4 °C off the root zone and pulls moisture from the substrate faster than plastic.
Bare-mineral top-dressing only, with no organic matter anywhere in the mix. Organic matter is fungal food in tropical summers.
Maximum airflow. A small oscillating fan running through the hottest hours is more impactful than any change to the substrate.
Reduce watering to once a month or less through the dormancy window. The plant will not look great by August; it will recover in autumn.
Accept some losses. Even careful growers in Singapore, Manila, or Miami lose a few plants per summer. It is the cost of the climate, not a sign of failure.
Frequently asked questions
- Should I bring them inside under AC?
- Yes if you have a bright window or grow lights. Cooler, dryer indoor air is a much better summer environment than a humid balcony.
- Which species handle it best?
- L. lesliei, L. aucampiae, and L. fulviceps are the toughest. L. optica and the karasmontana complex are the most likely to fail.
- Can I keep them in the fridge during heat waves?
- No. The temperature swing and condensation when removed cause more damage than the heat would have.
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Written by the Editorial Team. Spotted an error or want to add a regional note? Send corrections or apply to contribute.