Troubleshooting
Tatsoi problems — and how to fix them
Tatsoi (Brassica rapa var. narinosa) 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
Heat and long summer days push the rosette to flower and toughen the leaves. Sow in cool spring and autumn windows and keep moisture steady.
Flea beetles
Shothole the leaves and stunt seedlings, the most common pest. Grow under fine mesh from sowing and keep plants moist and vigorous.
Leaf rot and slugs
The ground-hugging rosette traps moisture and shelters slugs that graze the underside. Water at the base, space for airflow, and set slug barriers or traps.
Downy mildew
Yellow patches with grey growth beneath in cool, wet conditions. Improve spacing and airflow, water at soil level, and remove affected leaves promptly.
Prevent tatsoi problems before they start
Most tatsoi issues are care-mismatch, not bad luck. Dial in the basics:
Looking for tatsoi in general rather than its problems? Read the full tatsoi care guide — light, water, soil and feeding.
Tatsoi problems — FAQ
Why is my tatsoi bolting?
Heat and long summer days push the rosette to flower and toughen the leaves. Sow in cool spring and autumn windows and keep moisture steady.
Why is my tatsoi flea beetles?
Shothole the leaves and stunt seedlings, the most common pest. Grow under fine mesh from sowing and keep plants moist and vigorous.
Why is my tatsoi leaf rot and slugs?
The ground-hugging rosette traps moisture and shelters slugs that graze the underside. Water at the base, space for airflow, and set slug barriers or traps.
Why is my tatsoi downy mildew?
Yellow patches with grey growth beneath in cool, wet conditions. Improve spacing and airflow, water at soil level, and remove affected leaves promptly.