Look for yellow blossoms in April, and leaves turning amber.
Barberry doesn't shear well, so prune individual branches back into the bush to encourage new growth to arch gracefully. Evergreen wintergreen barberry (Berberis julianae), hardy in U.S. Department of Agriculture plant hardiness zones 6 through 9a, may be pruned from late winter through early shrubdigging.clubg: Rosemount MN.
Dead woods should be removed during summer months, and the bushes should be pruned in the period between mid winter to late winters, i.e., before spring. According to the University of Minnesota Extension, barberry bushes should be trimmed at the time of planting. This is important as it encourages the shrub to develop a strong shrubdigging.clubted Reading Time: 5 mins.
Evergreen varieties of barberry shear after flowering. The type of procedure also affects the timing. Sanitary pruning is carried out in March-April or in September-October. Rejuvenating procedure is best done in the spring. Formative pruning plan in the spring for a single-planted bush. If it is necessary to trim a hedge or curb, the procedure will be performed in 2 shrubdigging.clubg: Rosemount MN. Red Leaf Japanese Barberry Annual trimming is required if your shrub is Red Leaf Japanese Barberry (Berberis thunbergii"Atropurpurea").
The spreading purple foliage of this deciduous plant forms a Missing: Rosemount MN. For these plants, pruning should be done in the early spring, before they leaf out. Shear or prune the outer branch tips to shape and reduce the size of the plant. Repeat this pruning technique throughout the summer, as needed.
If you are forming a hedge, allow light to reach all areas of the hedge by leaving the base of the plants wider than the shrubdigging.clubg: Rosemount MN.