How to Manage Pests

Pests in Gardens and Landscapes

Bolting in cole crops

Bolting occurs when flowers develop too quickly. For seeds planted in the spring, flower stalk initiation in cabbage is stimulated by prolonged cold temperatures below 50° F. For fall-planted seeds, plants may bolt if they start to grow quickly and are then forced to slow down by cold temperatures. Bolting cannot occur until plants have received the cold chilling in the winter.


Plan to plant when environmental conditions during development will not stimulate bolting or the growth of flower stalks.

Bolting of broccoli
Bolting of broccoli

Statewide IPM Program, Agriculture and Natural Resources, University of California
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Agriculture and Natural Resources, University of California

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