Troubleshooting
Choy Sum 'Sumo' problems — and how to fix them
Choy Sum 'Sumo' (Brassica rapa var. parachinensis 'Sumo') 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 under stress
Heat, dryness, or root disturbance trigger fast flowering and bitter stems. Keep well watered, sow in suitable seasons, and cut stems young.
Flea beetles
Riddle seedling leaves with tiny holes, weakening young plants. Use fine mesh from sowing and feed for quick growth.
Caterpillars
Cabbage white and other larvae chew the broad leaves in summer. Net with insect mesh and pick off eggs and caterpillars.
Slugs and snails
Damage tender young plants and lower leaves in damp conditions. Clear debris, set traps, and protect seedlings.
Prevent choy sum 'sumo' problems before they start
Most choy sum 'sumo' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for choy sum 'sumo' in general rather than its problems? Read the full choy sum 'sumo' care guide — light, water, soil and feeding.
Choy Sum 'Sumo' problems — FAQ
Why is my choy sum 'sumo' bolting under stress?
Heat, dryness, or root disturbance trigger fast flowering and bitter stems. Keep well watered, sow in suitable seasons, and cut stems young.
Why is my choy sum 'sumo' flea beetles?
Riddle seedling leaves with tiny holes, weakening young plants. Use fine mesh from sowing and feed for quick growth.
Why is my choy sum 'sumo' caterpillars?
Cabbage white and other larvae chew the broad leaves in summer. Net with insect mesh and pick off eggs and caterpillars.
Why is my choy sum 'sumo' slugs and snails?
Damage tender young plants and lower leaves in damp conditions. Clear debris, set traps, and protect seedlings.