Cut back yarrow to within 6 inches of the ground after it has finished flowering. In colder climates, cut it back as one of the last chores in your garden before the snow flies. In warmer climates, cut it back in the spring before it begins to bud.

When can yarrow be cut back?

Cut back yarrow to within 6 inches of the ground after it has finished flowering. In colder climates, cut it back as one of the last chores in your garden before the snow flies. In warmer climates, cut it back in the spring before it begins to bud.

Should you deadhead yarrow?

Deadheading Yarrow Plants Deadheading allows the plant to redirect its energy back toward growth and making new flowers, which will prolong the blooming season, according to PennState Extension. It takes little effort to deadhead yarrow, but you need to do it continuously throughout the blooming season.