Troubleshooting
Mizuna problems — and how to fix them
Mizuna (Brassica rapa var. niposinica) 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.
Flea beetles
Beetles riddle the leaves with tiny holes, worst on seedlings in warm, dry spells. Protect with fine mesh, keep soil moist, and grow plants on quickly to outpace damage.
Slugs and snails
They graze the tender leaves, especially in damp conditions and on seedlings. Use barriers, traps or wildlife-safe controls and keep the bed clear of debris.
Bolting in heat
Although bolt-resistant, prolonged heat or drought will eventually send plants to flower, sharpening the flavour. Provide light shade and even moisture, and harvest leaves young.
Cabbage white caterpillars
Summer caterpillars chew the foliage. Net with fine insect mesh and pick off eggs and larvae from leaf undersides by hand.
Prevent mizuna problems before they start
Most mizuna issues are care-mismatch, not bad luck. Dial in the basics:
Looking for mizuna in general rather than its problems? Read the full mizuna care guide — light, water, soil and feeding.
Mizuna problems — FAQ
Why is my mizuna flea beetles?
Beetles riddle the leaves with tiny holes, worst on seedlings in warm, dry spells. Protect with fine mesh, keep soil moist, and grow plants on quickly to outpace damage.
Why is my mizuna slugs and snails?
They graze the tender leaves, especially in damp conditions and on seedlings. Use barriers, traps or wildlife-safe controls and keep the bed clear of debris.
Why is my mizuna bolting in heat?
Although bolt-resistant, prolonged heat or drought will eventually send plants to flower, sharpening the flavour. Provide light shade and even moisture, and harvest leaves young.
Why is my mizuna cabbage white caterpillars?
Summer caterpillars chew the foliage. Net with fine insect mesh and pick off eggs and larvae from leaf undersides by hand.