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Broccoli and cauliflower plants exposed to prolonged periods (four or more days) of temperatures below 50 F may form heads prematurely. This premature head development is called buttoning. Buttoning occurs when plants are exposed to stressful conditions, such as prolonged periods of cold temperatures, dry conditions, and infertile soils. Also, large plants are more likely to button than young plants. Plants that button do not form usable heads