Deadhead/ˈdedhed/ Definition 1 of 4Pro Tip 1/2Gardening Action Use 'deadhead' when talking about taking care of plants and gardens. I need to deadhead the daisies to promote new growth. Pro Tip 2/2Regular Maintenance 'Deadheading' is a routine task to keep plants healthy. Deadheading should be done weekly during the blooming season.