Answer: Winter hardy plants such as these that have been outdoors at the nursery and are therefore already acclimated to the weather can be successfully planted very early in the spring, as long as the soil is workable. Workable means it is not completely saturated and muddy, and not too frozen to dig.
It is better to plant them as early as possible rather than waiting. This longer time in the ground allows the roots more time to become established before the hot summer weather comes, and also protects the roots from temperature swings.
In the meantime, keep them outdoors in a location that is sheltered from the wind and in full morning sun if possible. Take care to keep the soil slightly moist while they are waiting to go into the ground. You could also heap some mulch over and around the pots to moderate the temperature in the rootballs. But once again, plant them asap. Good luck with your new shrubs!
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