Answer: If you have a greenhouse, you can pot up the pepper plants from your garden and bring them indoors. They'll continue to produce, though much more sparingly, for a while. Some gardeners keep their peppers indoors over the entire winter--by spring, they are usually pretty ragged-looking, but they pick up again once they're out in the garden.
Because the days are getting shorter and the sun is much less intense in the fall, I would not expect a big harvest from indoor peppers. Even if you use supplemental lighting, it just can't compare with the intensity of the sun on a midsummer day. An Epsom salt solution sprayed on leaves provides additional magnesium to the plants. This is useful for a vigorously-growing plant, but won't push a plant to grow in a low-light situation. Also, the pungency (heat) of hot peppers is greatly influenced by air temperature. Hot weather generally leads to more pungent peppers.
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