Brassica plants grow rapidly and go to flower instead of producing edible leaves or other edible plant parts. Bolting is often a result of extreme environmental conditions such as periods of draught, dry soils. Some varieties of brassicas have been bred to be less susceptible to bolting.
Remedy: No Chemical Control currently on the market. Sow bolt resistant varieties and keep the soil moist.
Cultural methods: Sow bolt-resistant varieties and keep the soil moist. Raise plants in the greenhouse and plant out when the temperatures are warmer, or sow directly under cloches or fleece to provide additional warmth.