Many annuals are perennials in frost-free climates, and some can be grown indoors as houseplants. If you start your annuals outdoors, and then bring them indoors for the winter, this is called overwintering your plants. Not all annuals are suitable for this, but many are.Click to see full answer. In this way, how do you keep annuals alive in the winter?To overwinter your annuals indoors, dig up the entire plant before your first fall frost. Cut the plants back by about a third and plant them in pots with fresh organic potting soil. Another way to overwinter annuals is to take cuttings from your existing plants.Similarly, can you keep petunias inside over winter? Petunias, though, are actually perennials. In year-round warm climates, they survive and sometimes bloom throughout the winter. If you want your petunias to grow back in the spring, store them indoors during the winter. In respect to this, can you keep annuals in pots over winter? Annual Flowers for Indoor Use. Annuals by definition are plants that survive just one growing season. Some annuals are actually perennials or even woody shrubs in other parts of the country but, because they are not frost tolerant, cannot survive our winters. Another popular annual, impatiens, can also be grown indoorsCan you keep Spike plants over winter?If your spiky, dracaena starts to look a little ragged, the condition may be due to cool nighttime temperatures. Dracaenas include a wide range of tropical plants, and some varieties can survive outdoors in temperatures cooler than other varieties. You can save the plant by overwintering it in a protected location.