Quick answer: Stump Grinding Aftercare — A stump is the part of the problem that is still in the ground: it holds the roots that lift pavement, keeps a species alive if it re-sprouts, and occupies the spot where the next planting goes. Grinding removes it below the surface so the ground can be worked again, and the roots that matter are the ones under the driveway rather than the ones beside the trunk.
Field note. On this coast the stump is rarely the end of the job: Monterey pine and eucalyptus both keep enough energy in the roots to push new growth, so we are looking at the species before we quote the grind rather than after.
On the other hand, a stump left in a garden bed is sometimes the better answer — it decays, feeds the soil and costs nothing — so grinding is a choice, not a rule.
The grinder leaves a hole full of a mixture of shredded wood and soil, and everything that goes wrong afterwards starts there. The hole settles, the fill sinks, the lawn dips, and the new tree planted into the mix declines for reasons that look mysterious.
Why the grindings are not fill
Fresh wood chips and soil mixed together decompose over three to five years, and as they decompose they lose volume — often a third or more of the original. A hole filled to grade with grindings will be a depression within two seasons and a deeper one after five.
They also lock up nitrogen while they break down, because the microbes doing the decomposing need nitrogen and take it from the surrounding soil. A plant in that material is competing with the decomposition for the same nutrient, and it loses.
The right sequence
Remove the grindings. All of them, or as much as the excavation will give. They are useful elsewhere as mulch, spread thin over a bed, and they are harmful in the hole.
Refill with topsoil in layers, tamping each layer lightly. Light tamping, not compaction: the aim is to remove the air pockets that cause the settling, not to make a sealed surface.
Leave the fill slightly proud — an inch or two above grade — because it will settle further. A hole filled exactly to grade is a hole that becomes a dip.
What to do with the chip
Spread it as mulch somewhere it will do good: over a root zone, around shrubs, on a path. Two to three inches, kept back from trunks. Do not mound it against a tree, and do not use it as a planting medium.
If there is more chip than there is garden, it is worth offering to a neighbour rather than paying to have it hauled. Arborist chip is a resource that people pay for elsewhere.
Replanting in the same spot
The honest answer is that the same species should not go back into the same hole for several years, and often should not go back at all.
The reasons stack. The old root system is still decaying in the surrounding soil, and some of the fungi doing that decay are pathogenic to a young tree of the same species. The soil structure is disturbed. And if the original tree died of a soil-borne disease, the pathogen is still there.
Where a replacement is wanted, plant it offset by at least the radius of the old canopy — outside the stump hole entirely — and choose a different species if the original died of anything other than old age or a clear above-ground cause.
The surface problem
Grinding disturbs a circle of ground that is larger than the stump and smaller than the root system. That ring of disturbed soil is the place where weeds establish first and where the lawn thins. It needs topsoil and seed, or a mulch ring, in the same season.
On a slope the disturbed ground is also the place where water will start to channel, which is why erosion control and stump work are the same conversation on any lot with a grade.
What a good job looks like two years later
No dip. No ring of dead grass around a sunken patch. No mushrooms in a circle following the old root pattern — that is a sign of active decay under the surface and often of a fill that was mostly chip. And a lawn that mows flat across the spot, which is the only test the owner actually cares about.