Cilantro is a cool-season herb that bolts rapidly once heat arrives — the goal is to stay ahead of it with succession sowings every two weeks. Sow from mid-March through mid-April, then stop when temperatures climb above 80°F. Resume succession sowing in August as the heat breaks for a full fall crop. Caribe is a slow-bolt variety that gives more leaf before flowering than standard types.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.
Damping Off
Seedlings collapse at the soil line with thin, water-soaked stems; seeds may fail to emerge or rot before sprouting.
Sow in well-draining mix, avoid overwatering, and ensure good airflow. Remove affected seedlings and let the surface dry between waterings.
Bacterial Leaf Spot
Angular dark brown to black spots on leaves, often bounded by veins. Spots may merge and cause leaves to yellow and collapse in wet conditions.
Use clean, treated seed and avoid overhead watering. Space plants for airflow, remove infected foliage, and rotate out of the same bed for two years.