Exposure to the sun giving higher temperatures in the cold frame. Lettuce and green vegetables will flourish in these conditions. This is the growing season typically from late August until December.
Winter
This is the harshest growing season, so you should plant the hardiest plants. Salad greens such as arugula, spinach, mache, and lettuces will be the most successful. Spinach will continue to produce beyond the first harvest, but other salad greens will require a more intensive seed sowing rotation. Generally, sewing seeds in January should give you a March harvest. Spring
This is the time to plant your salad plants to bring them on for your vegetable plot, to get you an early start. You should start your vegetable plot plants about five weeks before the last frost.
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A year round harvest
Growing in a cold frame will take a little time to perfect, but successful growing seasons are not hard to come by. The winter will be the most difficult season to produce a successful crop since the temperatures are the coldest, days are
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shortest and the angle of the sun is the lowest so the cold frame will be much cooler. Good timing and careful practice, while learning from previous years experience will yield a successful harvest. In very cold conditions adding heating would turn your cold frame into a heat box but that would require electricity. While maintaining a warm environment is essential it is equally important to make sure it does not get too warm. This can be done by just leaving the lids ajar.
Autumn will be the season when you get your most plentiful crop from your cold frame because the earth is still warm from the summer sun. The spring is a good time to put your potted plants in the. The earth will still be cold from the winter so putting your planters, with their sprouting summer plants will be very beneficial.
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