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How to prune flowers
Deadhead flowers to remove spent growth during the flowering season.
As flowering plants bloom, you may need to remove spent buds to help encourage new flowers and a stronger overall plant. To deadhead a flowering plant, you want to cut the branch or stem off at a 45 degree angle, just above a new bud.
Depending on how thick the stems of your plant are, you will need to use either gardening shears or a hedge trimmer to deadhead your plant. Plants that grow aggressively or that produce a large number of flowers may need to be deadheaded more frequently.