Barbara is right. Bring them inside before cold weather and treat them as house plants. Growing through the winter is easy. Give half-strength fertilizer in the spring, and regular water with a well draining mix (like a cactus mix) and as much sunlight or artificial light as you can give.
I seed them thick in a pot or flat-these are probably three years old. It's easy to care for them, and they don't take much room.
If you let them dry that first year, they will go dormant, but they are pretty tiny and you lose the time they could be growing. They also don't have much energy stored, so you risk losing them.
