Ann and ALL. who buy from sales in fall. I am not disagreeing here but want to pass on a hint I saw on another garden site.
When you buy from a nursery where you can choose the plants you want, be sure to inspect the pots for full root growth. A gentle tug on the plant should be enough to feel if its full rooted in the pot,also if roots are coming out of the bottom. This insures a plant that has been in the nursery ALL season.
The gardener went on to say ,many nurseries buy pluggs and repot them just for a half price sale. She felt these plug sale plants had less of a chance for winter survival.
The plugs slide out easily because they have just been planted. AVOID these plants at "end of season" sale.