Troubleshooting
Short-leaved Deuterocohnia problems — and how to fix them
Short-leaved Deuterocohnia (Deuterocohnia brevifolia) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Rot from winter moisture
Water trapped within the tight cushion in cool, overcast conditions causes blackening and collapse of rosettes. Keep the cushion surface dry from October to March; grow in a cold frame or under glass with the lid open on dry days to maintain airflow.
Mealybugs within the cushion
The densely packed rosettes provide ideal cover for mealybug colonies, which can be well-established before symptoms — yellowing or collapse of individual rosettes — become visible. Treat with a systemic insecticide diluted into a drench, ensuring penetration into the centre of the cushion.
Prevent short-leaved deuterocohnia problems before they start
Most short-leaved deuterocohnia issues are care-mismatch, not bad luck. Dial in the basics:
Short-leaved Deuterocohnia problems — FAQ
Why is my short-leaved deuterocohnia rot from winter moisture?
Water trapped within the tight cushion in cool, overcast conditions causes blackening and collapse of rosettes. Keep the cushion surface dry from October to March; grow in a cold frame or under glass with the lid open on dry days to maintain airflow.
Why is my short-leaved deuterocohnia mealybugs within the cushion?
The densely packed rosettes provide ideal cover for mealybug colonies, which can be well-established before symptoms — yellowing or collapse of individual rosettes — become visible. Treat with a systemic insecticide diluted into a drench, ensuring penetration into the centre of the cushion.