I got the plant from Walmart, and fall and winter is coming. Can I bring the plant in and keep it growing in the winter or will she die because she is a plant that lasts only a year?
Lobelia is an annual plant, not suited to living in a house. It is possible to save the seeds, though, and start them in the spring. Your plant may also have small plantlets growing from the base that can be started as separate plants. These articles will give you some more information: https://www.gardeningknowhow.com/ornamental/flowers/lobelia/lobelia.htm