Later in the summer, you may choose to cut the blades in a fan shape no shorter than five to six inches. It does not take them long to produce new growth and add green color to your landscape. When you add mulch to the bed, be sure that the rhizomes are not buried. These should remain at the surface of the soil and have some exposure to the air.
I have verbena and was told to deadhead it. Why should I do this?
The goal of most flowers is to reproduce by growing seeds within the spent flowers. Deadheading is the practice of removing spent blooms from the plant before the seed forms. Removing old blooms will cause many plants to quickly bud and bloom again in order to reproduce before the season is over. The practice of deadheading will give you a longer season of color in the bed. This is true for many flowering plants.