Answer: Although it would theoretically be possible to grow greens in an air-conditioned greenhouse or indoors under lights in the summer time, you might want to experiment with growing some of the more heat tolerant greens instead. Swiss chard, Malabar or New Zealand spinach, and the old standby red oak leaf lettuce might be possibilities. You can also extend your lettuce harvest by making successive sowings 10 days to 2 weeks apart, so you always have a supply of young greens. Since hot weather can inhibit lettuce seed germination, during warm weather cover the seedbed with a board or a light mulch to shade the soil and keep it cool, removing the cover at the first sign of germination.
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