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Douglas Fir Trees

Q.Is it OK to cover gaps between exposed roots of Douglas-Fir trees with soil?

Zone Tacoma, WA 98466 | Anonymous added on February 9, 2020 | Answered

My need is to establish more even ground levels on SLOPED areas along one-side-only of several Douglas-fir trees which are along the property line where my neighbor and I want (and need) to install a wood fence.

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Answered on February 9, 2020

The advice given by arborists is not to put more than 2 inches of soil or mulch over tree roots. Roots require oxygen (leaves utilize CO2); covering half of a tree's roots with more than that may lead to problems.

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