Jean B. wrote:
I have some trees with very prominent roots, which are getting
battered by the folks who mow the lawn. I know, from reading here
that I can't just pile mulch or dirt on top of them, but can I
build up the area between them a bit to lessen the impact of the
mowers? These areas seem to have become more sunken over the years.

Thanks,

Kill the grass and then apply a thin layer of mulch.

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Travis in Shoreline (just North of Seattle) Washington
USDA Zone 8
Sunset Zone 5