When to Plant Transplant young, vigorously growing plants in early spring. Plants that remain too long in seed flats may produce "button" heads soon after planting. For fall crops, buy or grow your own transplants or plant seeds directly in the garden. For fall planting, start seedlings in midsummer for transplanting into the garden in late summer. To determine the best time for setting your fall transplants, count backward from the first fall frost in your area and add about 10 to the days to harvest from transplants. Remember that time from seed to transplant is not included in this figure.

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