To prune spirea, wait until the dormant season, which is in the middle of winter, trim back one-third of the overall plant size, and remove any dead or stray branches. Trim a spirea plant to increase the number of blossoms in the spring with instructions from a sustainable gardener in this free video on gardening.
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Hi, this is Yolanda Vanveen, and in this segment, we're going to talk about how to prune spirea. Spirea is a beautiful bush. There's a lot of plants right behind me at the farmer's market that I do each summer, and they just grow so beautifully. But if they're not pruned, they get kind of wild. They get all these wild branches. They look like a Medusa. So the trick to pruning them is to wait 'til their dormant period, which is in the fall or the winter, and basically you want to cut the whole plant down one-third. And you want to even it out, cut a lot of the dead branches out, and even to the middle of the plant just by cutting one-third of all the branches out and not cutting any of the main branches. Just all the tiny branches. You will find the next year, it will grow much fuller and much nicer. Instead of having all Medusa-like branches, it'll be a nice, round or square shape -- whatever shape you want it to grow in, you can have it grow that way. And you'll get lots of flowers on your spirea bush and it'll look beautiful and full and everything will do much better than if you never pruned it at all.