Dead woods should be removed during summer months, and the bushes should be.
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 spring.
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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 when to cut back barberry bushes important as it encourages the shrub to develop a strong shrubdisposal.barted Reading Time: 5 mins. Both deciduous and evergreen varieties should be pruned in the summer. Barberry shrubs bloom on woody growth produced in the previous season.
The Japanese barberry is one of the most common barberry shrubs grown in landscapes.
It is best to prune as soon as the flowers are done in late summer or early fall. Barberry pruning done in winter while the plant is dormant will result in fewer flowers during the next growing season.