When to Plant Sow seeds in early spring. Make small plantings every 2 to 3 weeks for continuous spring and early summer harvest. For an especially early harvest, plants may be started indoors or in the greenhouse in flats to be transplanted into the garden as soon as the ground becomes workable. Like cabbage, kohlrabi plants can stand some frost. One or two late plantings can also be made in mid-summer at the same time as late cabbage. In very hot weather, these seedlings may benefit from some shade when they are small.

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