Feb 22, Prune all of the stems down to 6 to 8 inches in early to mid-April. This keeps your shrubs approximately the same size each year since they begin their growth from the same starting point.
Wait until May when buds begin to swell and growth emerges. Heavy pruning should be done in late winter or early spring while the shrub is still dormant. 3 Inspect your shrub in early spring and remove any wood that does not have buds. Dec 21, Pruning the blue mist shrub of any deadened branches, due to harsh winter and freezing, should be postponed until the plant begins to leaf out in the spring.
The entire shrub may be cut back to the ground in the spring and, in fact, enlivens the specimen and fosters a more attractive evenly rounded treeclearance.buzzted Reading Time: 2 mins. Apr 20, In autumn, prune back the entire shrub to within 6 inches of the ground, as recommended by the University of Vermont Department of Plant and Soil Sciences.