My son is putting together a tree inventory for the local city park as a service project. He's already gone to a lot of work measuring, counting, identifying around 400+ trees with the hopes to estimate their age based off of the formula of: Diameter in inches x growth factor = tree age. The city understands this method is only a rough estimate and is okay with this approach; I don't want this thread to be a debate on if this is the best method but rather hoping I could get some advise/guidance from the experts on where to find a comprehensive list that show the growth factor for various tress in the US? I've already been directed to: http://mdc.mo.gov/your-property/your-trees-and-woods/backyard-tree-care/how-old-tree which seems to be the resource several websites point to. This site did help but there are several more trees we're not able to find the growth factor on and we've both seem to have "googled" ourselves out trying to search lol. Any suggestions of a more comprehensive list of growth factors?
Thanks in advance
Thanks in advance