The best time to transplant lilac shrubs is in the spring, before the plants leaf out, according to the North Dakota State University Extension. Do not fertilize your transplanted shrubs for the first two years, advises the Montana State University Extension.
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Aileen Clarkson has been an award-winning editor and reporter for more than 20 years, earning three awards from the Society of Professional Journalists. She has worked for several newspapers, including "The Washington Post" and "The Charlotte Observer." Clarkson earned a Bachelor of Arts in journalism from the University of Florida.