Troubleshooting
Lungwort 'Mrs Moon' problems — and how to fix them
Lungwort 'Mrs Moon' (Pulmonaria saccharata) 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
The most common problem, especially in dry or warm summers; cut back affected foliage hard after flowering and water well to encourage fresh growth.
Vine weevil
Adults notch leaf margins; larvae damage roots. Apply nematodes in late summer.
Leaf scorch
Direct sun, particularly in combination with dry soil, causes bleached and brown-edged foliage; move to a shadier position.
Slug and snail damage
Young leaves are vulnerable; use appropriate controls in spring.
Summer dormancy
Plants may look tired or go dormant in drought; consistent moisture prevents early die-back.
Prevent lungwort 'mrs moon' problems before they start
Most lungwort 'mrs moon' issues are care-mismatch, not bad luck. Dial in the basics:
Lungwort 'Mrs Moon' problems — FAQ
Why is my lungwort 'mrs moon' powdery mildew?
The most common problem, especially in dry or warm summers; cut back affected foliage hard after flowering and water well to encourage fresh growth.
Why is my lungwort 'mrs moon' vine weevil?
Adults notch leaf margins; larvae damage roots. Apply nematodes in late summer.
Why is my lungwort 'mrs moon' leaf scorch?
Direct sun, particularly in combination with dry soil, causes bleached and brown-edged foliage; move to a shadier position.
Why is my lungwort 'mrs moon' slug and snail damage?
Young leaves are vulnerable; use appropriate controls in spring.
Why is my lungwort 'mrs moon' summer dormancy?
Plants may look tired or go dormant in drought; consistent moisture prevents early die-back.