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Plant Amnesty was founded by arborist Cass Turnbull on October 22, 1987, as a mock protest group intended to educate the public about the problems associated with pruning techniques which are biologically harmful to plants and counter productive to the goals of landscape design and management; most notably tree topping. The stated mission of the organization "is to end the senseless torture and mutilation of trees and shrubs." Plant Amnesty also provides an "adopt-a-plant" exchange for unwanted, healthy plants.
- Sullivan, Ron. "Garden Variety: Plant Amnesty Teaches Impacts of Bad Pruning". Berkeley Daily Planet. Archived from the original on 2007-09-27. Retrieved 2011-04-23.
- "Charities: Charitable Solicitations Program Charity Profile Report". Secstate.wa.gov. 2009-12-31. Archived from the original on 2012-08-05. Retrieved 2011-04-23.
- Ann's Organic Garden: Let Plant Amnesty prune you into shape[dead link]
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- "Welcome to PlantAmnesty". Plantamnesty.org. Archived from the original on 2011-04-29. Retrieved 2011-04-23.
- "Elisabeth C. Miller Library: Gardening Answers Search Results for "2100"". depts.washington.edu. Archived from the original on 2008-06-24. Retrieved 2007-08-14.