You'll need to take them indoors, Edna. Frost will kill them. They do make good houseplants for a while, as long as you pinch out the flowers. Once they start dropping their leaves, it's time to compost them (or possibly take cuttings) and start new ones from seed.

keep them inside in winter and give them a feed , you can take cuttings from new shoots in spring for more plants to,

oops snap barbara haah

You can also try taking cuttings to root to keep indoors and increase your stock for free., for next year.