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As Horticulturist Dave Cantwell demonstrates, winter is a great time to prune trees and shrubs. Follow his tips to make all the right cuts. Want to learn more? Tim Johnson, Director of Horticulture teaches “Pruning Principles” each March, before trees come out of dormancy. For more information on this and other classes, visit the Joseph Regenstein Jr. School at chicagobotanic.org/adult_education.