If you leave any wood, roots or grindings in the hole as fill, the hole will
sag when it decomposes and you will get some really nice mushrooms in that
spot. It could take 1-3 years for this to become evident.
Clean the hole out, fill with a little soil, pack, fill a little more, pack
some more until it is level. Water it in and add more soil if necessary.
If it was a big tree, there will still be roots deeper down and you still
may get sag later. Just don't build a spa or something that needs to be
stable without improving the spot.
The lot upon which my home was built (1991) had many mature trees removed and
their stumps ground down to below surface level.
However, you should be prepared for a "lifetime" of sinking ground and
topping-off with soil and re-seeding as the remnants of the tree rot away
below grade. My back yard is pocked with holes that can "never" be
permanently filled. It's an ongoing process. Good luck!
Not necessarily -- walnut, for example, is quite nasty chemically for
growing much of anything else. Many other species have their own
characteristics that are less than desirable as compost material--the
high tannic acid content of oak, for another example.
Not a good idea. If someone wants to use wood chips for building
soil,it's better in a compost heap or as mulch. When it decays, if left
in the hole, then there will be voids or a depression. I would get a
load of fill soil, depending on how large the hole, finish off with
about 6" topsoil, plant grass seed or sod.
And once it decays, you can fill it again, correctly this time. That wood
will continue to rot for a long time.
Be sure, also, that the stump is gone for a good distance down. About 12 or
more years ago I had to take down a tree that was dying. It had about a 12"
diameter trunk. We cut it down OK, then took the stump down about 8 inches
and filled the hole. The stump eventually rotted out the rest of the way.
What I did not realize at the time was that the builder had filled the land
a bit around the tree at least a foot or two. My wife happened to step on
the slight depression and almost her entire let went into the hole.
Fortunately, my SIL and grandson were there to help her out. It took many
years for it to do that, but it left a void. I've since filled it in with
some stone, clay, then topsoil and it has been ok, just a minor 2"
depression about a year later from the final settling.
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