Question: I have spirea and forsythia that have gotten very few blossoms this year and last year, too. Any ideas as to what I could do to promote better blossoming from these bushes? Should I trim them down? Should I dig them up and get new plants? Thanks everyone!
Hardiness Zone: 5a
Sandy from WI from Stoughton, WI
Answer: Sandy,
One of the best ways to perk up your bushes is through rejuvenation pruning. This is a great solution for plants that are getting thin and straggly or when their flower production starts to drop off. Each year for three years, remove 1/3 of the largest branches nearest the ground. You can either cut them back by 1/3 or remove them completely. Both Forsythia and Spirea can withstand severe pruning, so instead of taking three years to complete the process, gardeners with less patience will be happy to know that they can get away with cutting back the entire plant back in one year. After that some patience will be required though, as you wait for the plants to come back. Because Forsythia blooms on old wood, a good time to cut it back is shortly after it finishes flowering. Spirea can be pruned in the late winter or early spring. If it's been a while since you refreshed their soil, add some compost this fall.
Ellen
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