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How to Prune a Baby Bottlebrush. The bottlebrush (Callistemon spp.), hardy in U.S. Department of Agriculture plant hardiness zones 9a to 11, takes its name from the showy flowers that resemble a. Sep 21, Hardy in zones 9 and above, bottle brush shrubs attract hummingbirds, bees and butterflies.
Make the cut just above a strong bud.
Bottle brush shrubs bloom on new growth, so they can be pruned in spring and again after flowering. Prune in spring after new growth starts by tip pruning or cutting 2 to 3 inches back into the branches.
Make the cut just above a strong bud.