Troubleshooting
Lemon balm problems — and how to fix them
Lemon balm (Melissa officinalis) 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.
Self-seeds everywhere
Cut back before seed sets if you want to control spread.
Leggy after flowering
Cut back hard for a fresh flush of leaves.
Powdery mildew
Late summer; improve air flow.
Faded flavour after years
Divide every 3-4 years.
Aphids
Rinse with water.
Prevent lemon balm problems before they start
Most lemon balm issues are care-mismatch, not bad luck. Dial in the basics:
Lemon balm problems — FAQ
Why is my lemon balm self-seeds everywhere?
Cut back before seed sets if you want to control spread.
Why is my lemon balm leggy after flowering?
Cut back hard for a fresh flush of leaves.
Why is my lemon balm powdery mildew?
Late summer; improve air flow.
Why is my lemon balm faded flavour after years?
Divide every 3-4 years.
Why is my lemon balm aphids?
Rinse with water.