Spinach is an annual that grows to maturity in about 25-40 days. It is a hardy cool-season crop that does best at temperatures of 60 to 65ºF, but can withstand temperatures as low as 20ºF. Spinach is intolerant of temperatures above 77ºF, these warm temperatures combined with long days initiate the plants reproductive stage, causing it to bolt or flower prematurely. That means that spinach thrives when planted early in the spring for a late spring harvest, and late in the summer for a fall harvest.
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