Grasshoppers can be an occassional pest on perennials especially during hot and dry periods (end of Aug, early Sept) when many weeds are drying up. Grasshoppers move into container grown perennials and annuals and feed on plants. Growers report feeding damage especially on plants in outdoor production yards. Outbreaks are usually preceded by several years of hot, dry summers and warm autumns. Dry weather increases the survival of nymphs and adults.
Grasshoppers have many natural enemies that help control their populations. To manage grasshoppers, manage weeds around outdoor production yards to make the area less attractive to grasshoppers and easier for natural predators such as birds.
Pesticides can be used if feeding is significant.
For more information, see the fact sheet: Grasshoppers: Life Cycle and Control by University of Maryland