I have an oak tree that is dying - Knowledgebase Question

Poway, CA (Zone 9A)
Question by norbys
July 26, 2005
I had to grade my backyard recently. The grading caused me to increase the depth of top soil in the area of an oak tree. I used a plastic ring to go around the trunk of the tree. I think, though, that I shocked the tree as all of its leaves have now browned. Did I kill my oak? Is there anything that I can do to bring it back?

Answer from NGA
July 26, 2005


I don't know whether or not your oak tree will adjust to the change in grade. While you did the right thing in trying to keep moist soil away from the trunk (which can cause rot), changing the grade over the root system can suffocate the roots. Oaks (and many other trees) have feeder roots which are close to the surface of the soil. This, coupled with the fact that the rest of the roots grew into spaces containing just the right ratio of oxygen and moisture, and they became accustomed to it, they may be suffocating, as well. You can only wait and watch. It may adjust. There's nothing you can do for your tree at this point - except remove the excess soil over the root system. That doesn't sound like it's a feasible solution, though, so let's just hope for the best.

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