Sow seeds ¼-inch deep in spring, four weeks before the last expected frost. Space seedlings one foot apart in rows three feet apart. For a fall crop, broadcast seed 8 to 10 weeks before the first expected frost; thin to 12 inches apart.
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Foliar feed with liquid seaweed extract two to three times during the growing season.
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Start picking outer leaves when plants are one foot tall. Frosts can actually improve flavor.