Overwintering newly potted Pussy Willow

I was gifted three pussy willow stems and was able to get them to grow roots. I potted them and placed them on my deck where they received late afternoon and evening sun. About 6 weeks ago new growth started.
I’m in 6B and we just had our first frost. I brought the plants into my sunroom for the night.
I don’t want to plant them until spring.
How do I over winter them? Inside with as much light as possible? In the dark basement? In the cool garage?
Thanks for any help.