I lost my pepper plant last season that was almost four years old because I did not protect it from the extreme cold. Normally, I will bring them indoors if the temperature gets under 40 degrees F. We do not drop below the 30's very often here, but when we do it kills tender vegetable plants. It is possible to have a tomato, a pepper, and even eggplants last several seasons if they do not freeze. The video shows what you should do if you have planted already and need to intervene when the weather turns. Plants are living creatures and are susceptible to frostbite like animals or humans.
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My container garden is brought into my home during cold spells. I wrap the base of the pot in a plastic garbage bag and set it on a large tote lid so that my carpet or floor does not end up with a stain from the soil or water that might leak out. As soon as the temps are above 50 again, they will go back outside. My living area gets a little crowded with this, but I like it better than having to buy new plants come springtime.
Watering in the winter should be sparse. The plants will still need hydration, but in light amounts. You will need to insure the roots aren't soaked when the weather dips around 32 degrees F.
If you have larger plants, like the ones I have in containers, placing a section of burlap over them or even a sheet or light blanket will help them survive the temperatures overnight. We often see large cactus wrapped in burlap layers for winter. They survive nicely with this protection. In the citrus orchards of South Florida and California, the winter routine is to set propane heaters around the trees for protection against freezing temperatures. The lady that rented me a room several years ago used to place microfiber blankets on her ice plants at night during winter. Any small favor you can pay these tender growing things will be most welcome by the plant. Doing nothing will insure you have a dead garden, Small chimeneas around the garden areas can be a good source for heat. The clay or metal of the chimenea radiates warm air that can help prevent the trees from freezing. These need to be tended overnight if you want the heat to keep until sunrise.
What are some other ways you can think of to provide a bit of heat and protection for a garden in the wintertime?