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Winter is a great time to prune trees and shrubs and gives us tips to make the right cuts. Want to learn more? Tim Johnson, Director of Horticulture teaches “Pruning Principles” from 1 p.m. to 3 p.m. on March 14, 2010. For more information on this and other classes, visit the Joseph Regenstein Jr. School at chicagobotanic.org/school.