Answer: In my experience it is almost always better to plant than to try to hold them in pots over the winter. I would plant them as soon as possible. The roots will continue to grow until the ground turns cold, this takes a while after freezing temperatures begin due to the insulating qualities of the soil and mulch you will be applying. Some gardeners like to use root stimulator, however it is probably most important to make sure the soil stays evenly moist (not sopping wet) until it freezes. Enjoy your new plants!
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