How about this for a different approach to the area around your trees?
This is a pecan tree in my back yard.
I planted monkey grass around it to see how it would look.
Personally, I love the way it looks.
Easier to mow around. Crowded out the weeds. And ended the need to put fresh mulch around the trees each year.
Eventually, I’ll have around every tree that surrounds my house.
Twisted Fencepost 