I’ve just potted mine on in preparation for the winter, also grown from seeds in the spring. I will keep them in the greenhouse for winter. No heat, just protected.
What I would do also, is nip out the longest shoots, just enough to one, remove any potential flower and, two, encourage the plants to 'chunk up' a tiny bit before winter. Once we're into frost weather, keep watering to a minimum, or hardly at all. They're more likely to stand extreme cold if kept on the drier side. H-C