This recommendation, presented by a GreenCO committee in February 2012, is the result of collaborative work by industry professionals representing the Colorado Nursery & Greenhouse Association (CNGA), municipal arborists/Colorado Tree Coalition (CTC), American Society of Landscape Architects-Colorado (ASLA-CO), Associated Landscape Contractors of Colorado (ALCC), and Colorado State University (CSU).
The purpose of the project was to create a single recommendation for green industry professionals that was based on respected sources and decades of hands-on experience by professionals involved in the growing, siting, installation, and care of trees. Current research in addition to the experiences of those on the committee was used in the development of the recommendation. The collective intent was to ensure the best possible outcome for the planting of trees in the landscape.