Flowering of spinach is affected by length of day, temperature, and variety. Bolt resistant varieties, often called long standing, should be used in the spring. Plant as soon as possible in the early spring and not later than six to eight weeks before daytime temperatures are expected to average above 75°F. Bolting is usually not a problem in fall planting, which should be about four to six weeks before the first average frost occurs.
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My spring-planted spinach sent up a flower stalk about the time it was ready for harvest. What causes this and what can be done about it?
Last Updated: April 21, 2011
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