Troubleshooting
Stephan's Cone Plant problems — and how to fix them
Stephan's Cone Plant (Conophytum stephanii) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Dormancy rot
Any moisture reaching the developing body inside the summer sheath causes irreversible rot. Maintain absolute dryness from May through August. If the sheath is inadvertently wetted, carefully remove it and allow the emerging body to air-dry in a warm, bright position.
Root mealybugs
A significant and often undetected pest in Conophytum collections. Plants suddenly wilt or fail to respond to autumn watering. Inspect roots at repotting for white waxy insects; treat with a soil drench of systemic insecticide and replace the growing medium.
Poor flowering due to incorrect rest
Conophytum require a genuine warm, dry summer rest to initiate flower buds. If grown in consistently cool or moist conditions year-round, flowering is unreliable. Replicate the hot-dry summer / cool-moist autumn cycle as closely as possible.
Prevent stephan's cone plant problems before they start
Most stephan's cone plant issues are care-mismatch, not bad luck. Dial in the basics:
Stephan's Cone Plant problems — FAQ
Why is my stephan's cone plant dormancy rot?
Any moisture reaching the developing body inside the summer sheath causes irreversible rot. Maintain absolute dryness from May through August. If the sheath is inadvertently wetted, carefully remove it and allow the emerging body to air-dry in a warm, bright position.
Why is my stephan's cone plant root mealybugs?
A significant and often undetected pest in Conophytum collections. Plants suddenly wilt or fail to respond to autumn watering. Inspect roots at repotting for white waxy insects; treat with a soil drench of systemic insecticide and replace the growing medium.
Why is my stephan's cone plant poor flowering due to incorrect rest?
Conophytum require a genuine warm, dry summer rest to initiate flower buds. If grown in consistently cool or moist conditions year-round, flowering is unreliable. Replicate the hot-dry summer / cool-moist autumn cycle as closely as possible.