That’s good… flowers turn into berries. Just leave them 🙂
– Niki

I read somewhere else that the container vs bedded plants is due to care. ie roots are better warmed in the ground, and less susceptible to too much heat or cold (thus why wrapping your pots or helping them in the winter is essential). As well, many people do container gardening but do not fertilize, and so nutrients are not replenished as often (another reason it is recommended).

It depends where you are of course, but I had great success with this method last winter in zone 5B and will definitely be doing the same this winter. Be sure to use something light like straw (leaves can get a bit too heavy and might smother/rot the plants).

You could likely keep them in your garage if you stored them in a box filled with straw to further insulate them. Or, if you planted the pot (container and all) in a garden and covered that with a deep layer of straw or leaves. If you bring them indoors, you’ll need to check for pests and keep them under grow-lights. There’s not enough winter light when you place them just in a sunny window. – Niki