Tree Care for Tree Problems.

http://e360.yale.edu/feature/peter_crane_history_of_ginkgo_earths_oldest_tree/2646/

http://www.wtnh.com/dpp/news/new_london_cty/clear-cutting-trees-causes-problems#.UZbXVKJthnQ

http://www.newsleader.com/article/20130504/LIFESTYLE/305040004/Mulch-volcanoes-do-more-damage-than-good Keep your trees healthy and avoid excessive mulch around the base of trees.

http://napavalleyregister.com/lifestyles/home-and-garden/columnists/bill-pramuk/construction-protection-for-trees/article_80ff9c20-b44d-11e2-88eb-0019bb2963f4.html