How to fertilize a large Red Oak Tree

Asked June 2, 2016, 11:33 PM EDT

I have two large red oaks (40 feet tall , 30+ inches in diameter), a new addition's foundation footers are 30 inches below surface. One tree has two sides infringed upon, One trench is 7 feet from one side and another trench 12 feet. from the red oak. The other two sides are not affected. Trees have been pruned every 5 or so years, so leaves quite high above the ground. Looking to determine what commercial brand / mix fertilizer would be best to apply to attempt to reduce any stress to the tree caused by digging foundation footers and disturbing its root system. Thanking you in advance for any information you can recommend. Stewart Connard

Montgomery County Maryland

1 Response

Although the tree may not show any apparent injury at this time from its reduced root system,it should be looked at by a licenced arborist. He may recommend some crown pruning to help balance its loss of roots. They may also recommend an injection type feeding system rather than throwing some fertilizer around the base of the tree.