Troubleshooting
Pak Choi 'Joi Choi' problems — and how to fix them
Pak Choi 'Joi Choi' (Brassica rapa var. chinensis 'Joi Choi') 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.
Bolting
Cold snaps after sowing, heat, or root disturbance push plants to flower early. Choose this bolt-resistant variety, transplant carefully, and sow in cool windows.
Flea beetles
Pepper the leaves with tiny holes, stunting seedlings. Cover with fine mesh from sowing and water well to keep young plants growing fast through damage.
Cabbage caterpillars
Cabbage white larvae chew leaves and bore into hearts. Net to exclude butterflies and pick off eggs and caterpillars, or use a Bt-based control.
Downy mildew
Yellow leaf patches with grey mould beneath in cool, damp weather. Space plants for airflow, water at the base, and remove affected leaves promptly.
Prevent pak choi 'joi choi' problems before they start
Most pak choi 'joi choi' issues are care-mismatch, not bad luck. Dial in the basics:
- Common turnip problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Pak Choi 'Joi Choi' watering schedule
- Pak Choi 'Joi Choi' light requirements
- Best soil mix for pak choi 'joi choi'
- Pak Choi 'Joi Choi' temperature & humidity
- Full pak choi 'joi choi' care guide
Looking for pak choi 'joi choi' in general rather than its problems? Read the full pak choi 'joi choi' care guide — light, water, soil and feeding.
Pak Choi 'Joi Choi' problems — FAQ
Why is my pak choi 'joi choi' bolting?
Cold snaps after sowing, heat, or root disturbance push plants to flower early. Choose this bolt-resistant variety, transplant carefully, and sow in cool windows.
Why is my pak choi 'joi choi' flea beetles?
Pepper the leaves with tiny holes, stunting seedlings. Cover with fine mesh from sowing and water well to keep young plants growing fast through damage.
Why is my pak choi 'joi choi' cabbage caterpillars?
Cabbage white larvae chew leaves and bore into hearts. Net to exclude butterflies and pick off eggs and caterpillars, or use a Bt-based control.
Why is my pak choi 'joi choi' downy mildew?
Yellow leaf patches with grey mould beneath in cool, damp weather. Space plants for airflow, water at the base, and remove affected leaves promptly.