Answer: Peppers can be very temperamental. They are especially sensitive to extreme temperatures -- a cool spell or heat wave during flowering can cause the flowers or small fruits to drop. Some people have better success with hot peppers than with bell peppers -- you might try some of the milder hot pepper varieties to see if you have better results. Peppers need full sun and warm soil. You can try covering the soil in early spring with black plastic, then once the soil is warm cut small holes in the plastic and plant the peppers. The black plastic will continue the warm the soil and radiate heat. Once the hot, dry days of summer come, keep an eye on the plants -- you might want to cover the black plastic with a straw mulch if it looks like the plants are getting "cooked". Here in northern Vermont we can leave the plastic on all summer.
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