Q.Can I winter over baby’s breath?
I want to bring my baby’s breath plants indoors, as the planters are special to me. They contain some of my mother’s ashes and baby’s breath were her favorite.
Here's an article on growing baby's breath: https://www.gardeningknowhow.com/ornamental/flowers/babys-breath/growing-babys-breath-flowers.htm
You can try bringing them indoors, I have seen a reference to growing them indoors for flowers during the winter, but I think it most likely that they will die back for the winter. But if you gather seeds and replant them in the planters in the spring, you could keep them going in the same containers almost indefinitely.