Answer: Callistemon viminalis (bottlebrush) can be thinned each year during the dormant season. Most of the leaves and flowers are produced at the ends of branches so prune carefully; if you cut back to bare wood the branches may not develop new foliage. Instead, prune away some, but not all, of the current season's growth. Your weeping bottlebrush is winter hardy in your zone and prefers all-day sunshine. Six hours of direct sun is the bare minimum. It will produce more flowers if it has 8-10 hours of direct sunshine during the spring and summer months. Enjoy!
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