Troubleshooting
Slow-bolt Cilantro problems — and how to fix them
Slow-bolt Cilantro (Coriandrum sativum 'Slow Bolt') 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.
Premature bolting
Heat above 29°C or water stress causes rapid flowering and bitter leaves. Sow in cool weather, provide afternoon shade in summer, and keep soil consistently moist.
Powdery mildew
Occurs in humid conditions with poor air circulation. Thin seedlings to recommended spacing and avoid overhead watering in the evening.
Damping off
Seedlings collapse at soil level due to fungal pathogens in waterlogged, cold soil. Sow into well-drained compost, avoid overwatering, and ensure good airflow around seedlings.
Prevent slow-bolt cilantro problems before they start
Most slow-bolt cilantro issues are care-mismatch, not bad luck. Dial in the basics:
- Common cilantro / coriander problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Slow-bolt Cilantro watering schedule
- Slow-bolt Cilantro light requirements
- Best soil mix for slow-bolt cilantro
- Slow-bolt Cilantro temperature & humidity
- Full slow-bolt cilantro care guide
Looking for slow-bolt cilantro in general rather than its problems? Read the full slow-bolt cilantro care guide — light, water, soil and feeding.
Slow-bolt Cilantro problems — FAQ
Why is my slow-bolt cilantro premature bolting?
Heat above 29°C or water stress causes rapid flowering and bitter leaves. Sow in cool weather, provide afternoon shade in summer, and keep soil consistently moist.
Why is my slow-bolt cilantro powdery mildew?
Occurs in humid conditions with poor air circulation. Thin seedlings to recommended spacing and avoid overhead watering in the evening.
Why is my slow-bolt cilantro damping off?
Seedlings collapse at soil level due to fungal pathogens in waterlogged, cold soil. Sow into well-drained compost, avoid overwatering, and ensure good airflow around seedlings.