All types of carnation can be overwintered outdoors without any problems, but do not tolerate moisture. For this reason, the soil should be very permeable even in winter.
Snow and frost do not usually bother carnations outdoors
Carnations in the garden
Carnations planted in the garden usually do not need any special winter protection, but can be left as they are. In the spring, you should only cut away any plant parts that may have frozen in the case of biennial or perennial varieties. Since many carnation species are basically only one to two years old, the question of overwintering is unnecessary. However, in this case you should ensure timely propagation.
cloves in the pot
In contrast to carnations, pot carnations should be protected from unfavorable temperatures, as the roots in the planters threaten to freeze to death. So place the carnations on a surface, such as Styrofoam, and in a protected corner. You should also not forget to water the plants in winter - but only on frost-free days.
tips
If you want to propagate your carnations by cuttings: in regions with mild winters, you can plant the cuttings directly in autumn, then they will take root right away.