Once a stump is ground, many owners want something new in that spot right away. The hole left behind looks like a ready planting pit. Planting after stump grinding can work well, though a few steps come first.
The ground under a former tree holds chips, decaying roots and sometimes disease. Handling those issues helps the next plant establish.
What Planting After Stump Grinding Involves
Stump grinding cuts the stump below the surface and leaves a mix of wood chips and soil. Large roots often remain in place beyond the grinding area. Those roots decay slowly over years.
The new plant will grow among that material. Planning around it gives roots room and air.
Removing the Grindings
Grindings are mostly fresh wood chips mixed with soil. As wood decays, soil microbes use nitrogen, which can leave less for new plants. A pit full of chips also settles as the wood breaks down.
Pull most grindings out of the planting area. Refill the hole with native soil, firming it in layers so it does not sink later.
Reusing Chips as Mulch
Clean grindings can serve as mulch elsewhere in the yard, as long as the tree was not diseased. UC IPM notes that organic mulch conserves moisture and moderates soil temperatures. It also advises keeping organic mulch 6 inches or more back from trunks.
Spread chips in a layer around beds rather than piling them. The post on tree mulch volcanoes explains why mounds against trunks cause harm.
Checking for Root Disease First
Why a tree died matters. The UC IPM page on Armillaria root rot explains that this fungus can persist for decades in partially decayed woody roots after a host dies or is removed. A new susceptible plant set into that soil may become infected.
Signs include clusters of honey colored mushrooms around an old stump or where an infected tree stood. UC IPM notes that mushrooms may not appear at all, so their absence is not proof.
Reducing Disease Risk
Removing, grinding or chipping stumps and large dead roots may help reduce the fungus in soil, UC IPM says. That page lists a beneficial fungus called Trichoderma colonizes small wood pieces such as chips. Soil solarization may not reach stumps or large roots below about 4 inches.
According to UC IPM, digging out residual roots is the most effective way to lower risk. Where root rot is confirmed or suspected, ask an arborist about plant choices and timing.
Moving the Planting Spot
One simple option is to plant a few feet away from the old stump. That places new roots in soil with fewer old roots and chips. It also avoids the zone where settling is most likely.
Check the mature size of the new plant. Make sure it fits the space without crowding walls, paving or overhead lines.
Lawn Mushrooms Where a Tree Stood
Mushrooms often appear in lawns where a tree was removed. UC IPM explains that many lawn mushrooms grow on buried dead roots, lumber and other organic matter. Most are harmless decomposers that release nutrients.
Many mushrooms are poisonous, and only an expert can tell them apart. Remove them where children play or pets roam.
Settling Over Time
Decaying roots leave voids as they break down. The surface above can sink over several years. A new plant set into that spot may end up too deep.
Firm the backfill well and check grade each season. Add soil as needed to keep the root crown at the right height.
Soil Drainage and Testing
Old tree sites sometimes drain poorly, especially where roots once held soil together. A quick drainage test shows whether water moves into the soil at a healthy rate. The post on running a soil drainage test covers the method.
Watering a New Planting
UC IPM notes that new trees and shrubs need more frequent water for up to two growing seasons. Check soil moisture before watering, since chips and loose soil can dry or stay wet in uneven ways. Overwatering is a common cause of decline.
The post on overwatered new plants describes the warning signs.
Timing the New Planting
Many trees and shrubs settle in more easily during cooler months. Fall planting lets roots grow during winter rains before summer heat arrives. The post on Sacramento planting seasons covers timing.
Disposing of Extra Grindings
Sacramento’s organics container does not accept stumps or limbs over 4 inches across. Grindings and chips may need another disposal option or reuse on site. Check the current City service guide before filling bins.
Street Trees and Replacement
If the removed tree stood in the planting strip, the City of Sacramento may manage it. Contact City Urban Forestry before planting in the right of way. Rules for street tree species and spacing may apply.
Digging the New Planting Hole
Dig the hole no deeper than the root ball and about twice as wide. Set the plant so its root crown sits at or slightly above the surrounding grade. UC IPM warns that planting in too deep a hole, especially in poorly drained soil backfilled with amended soil, can starve roots of oxygen.
Backfill with the native soil removed from the hole. Heavy amendments can create a pocket that holds water like a tub, so keep the backfill close to the surrounding soil.
Watching the First Year
Check the new plant weekly through its first summer. Look at leaf color, new growth and soil moisture a few inches down. Note any mushrooms near the base.
Early notes help an arborist or nursery diagnose problems. Photos taken each month show trends that are easy to miss.
Choosing the Next Plant
Pick a species suited to the spot’s sun, soil and water. Where root rot was a concern, ask about species less likely to be harmed. A local nursery, an arborist or the UC Master Gardeners can help narrow the list.
Planting after stump grinding goes well when the soil gets the same care as the plant. More topics sit in the tree care decisions category.