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- By George Bonnema, Luverne HorticulturalistJune 15, 2021The lilacs have finished blooming so if you need to prune them, this is the time to get that done. Remember to cut them back far enough to give them room to grow to the size you will want them to be. If there are no leaves on the stems when you have finished the task, that’s OK. They will develop new leaves on the stems that have been cut back. I noticed black spots showing up on Goldsrum…
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