Troubleshooting
Water Forget-me-not problems — and how to fix them
Water Forget-me-not (Myosotis scorpioides) 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 in late summer
The most common problem: white powdery coating on leaves appears in warm, humid, still conditions from August onwards. Cut plants back hard after the main flush of flowering in late summer; they typically regenerate a flush of clean new growth. Good air circulation reduces recurrence.
Short lifespan and self-seeding gaps
Individual plants often behave as short-lived perennials or biennials and die out after 2–3 years. Allow plants to self-seed around the pond margin — seedlings fill gaps reliably and the colony perpetuates itself. Alternatively, take stem cuttings each spring to renew the planting.
Slug damage in spring
Slugs readily graze the soft young foliage emerging in spring, leaving ragged holes in leaves. In moist pond margins slugs are abundant; use garlic-based spray or wool pellets (pond-safe) as deterrents and hand-pick slugs at night if necessary.
Prevent water forget-me-not problems before they start
Most water forget-me-not issues are care-mismatch, not bad luck. Dial in the basics:
Water Forget-me-not problems — FAQ
Why is my water forget-me-not powdery mildew in late summer?
The most common problem: white powdery coating on leaves appears in warm, humid, still conditions from August onwards. Cut plants back hard after the main flush of flowering in late summer; they typically regenerate a flush of clean new growth. Good air circulation reduces recurrence.
Why is my water forget-me-not short lifespan and self-seeding gaps?
Individual plants often behave as short-lived perennials or biennials and die out after 2–3 years. Allow plants to self-seed around the pond margin — seedlings fill gaps reliably and the colony perpetuates itself. Alternatively, take stem cuttings each spring to renew the planting.
Why is my water forget-me-not slug damage in spring?
Slugs readily graze the soft young foliage emerging in spring, leaving ragged holes in leaves. In moist pond margins slugs are abundant; use garlic-based spray or wool pellets (pond-safe) as deterrents and hand-pick slugs at night if necessary.