Article: This means that you should pick or cut the flowers that have died while the bush continues to bloom. Spent blooms will start to turn brown and will look very wilted. Cut the dead blooms back to where they attach to the stem. Doing this will ensure that your bush produce new flower buds longer into the blooming season than they would if the bush was left unattended. At the end of the season, you should dead-head all of the now finished blooms. This will help the plant along when creating buds for the next year. It will also limit the butterfly bush's chances of self-seeding and thus taking over your entire garden.
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Dead-head the spent blooms while the plant is flowering. Remove spent blooms at the end of the season.