What month is best to plant perennials?
Planting perennials after the last spring frost or at least 4 weeks before autumn frosts are expected in your area can help you avoid cold-damaged plants too. Just be sure to get your plants in the soil before hot summer weather kicks in. May is an ideal time for many perennials. Early spring and fall care are best times for transplanting. Then the weather is cooler and the plants are not using as much water. However, don’t move or transplant perennials while they are in bloom,” he says. As a general rule, wait a few weeks after they bloom before moving.