Troubleshooting
Maltese cross problems — and how to fix them
Maltese cross (Lychnis chalcedonica) 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.
Powdery mildew
White-grey fungal coating on foliage appears in warm, dry, or poorly ventilated conditions, typically in mid to late summer after flowering. Remove affected leaves, improve air circulation, and water at the base. Seldom fatal.
Short-lived crown
Can be short-lived, especially in heavy, wet, or poorly drained soils. Division every two to three years in early spring reinvigorates plants. In ideal moist conditions it is reliably long-lived.
Stem collapse and flopping
In windy or exposed positions, tall stems may collapse before or after flowering. Insert bamboo canes and string supports in spring, or grow compact cultivars. Staking is less needed in full sun positions with firm, moist soil.
Prevent maltese cross problems before they start
Most maltese cross issues are care-mismatch, not bad luck. Dial in the basics:
Looking for maltese cross in general rather than its problems? Read the full maltese cross care guide — light, water, soil and feeding.
Maltese cross problems — FAQ
Why is my maltese cross powdery mildew?
White-grey fungal coating on foliage appears in warm, dry, or poorly ventilated conditions, typically in mid to late summer after flowering. Remove affected leaves, improve air circulation, and water at the base. Seldom fatal.
Why is my maltese cross short-lived crown?
Can be short-lived, especially in heavy, wet, or poorly drained soils. Division every two to three years in early spring reinvigorates plants. In ideal moist conditions it is reliably long-lived.
Why is my maltese cross stem collapse and flopping?
In windy or exposed positions, tall stems may collapse before or after flowering. Insert bamboo canes and string supports in spring, or grow compact cultivars. Staking is less needed in full sun positions with firm, moist soil.