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For a large tree, roots can take 5 to 10 years to completely decay after a stump dies. But that’s rarely a concern for above-ground plants and growth. You can choose to grind up a stump immediately after felling a tree (although it will be tougher wood), or you can wait several months up to a year for the stump to decay. When finished, you can leave any leftover roots in the ground to decompose.

Rock salt or Epsom salt can damage and kill tree roots over several weeks and can even assist in removing the tree's stump. However, you need to drill holes or cut into the stump and surface tree roots to inject them properly with the salt. Repeat the process every two weeks until the roots visibly rot away.

While you can leave roots in the ground, if you don’t want the shrub to regrow again over time, it’s best not to leave any roots behind. Ensure you remove as much of the shrub as possible, including the root ball and any main roots you can see, to prevent new growth. Some gardeners opt for using a chemical treatment to prevent the stump from growing back, but this can kill beneficial microorganisms living in your soil.

The fastest way to remove a tree stump is to use a stump grinder. You can hire a professional stump removal service or rent the machine. If you choose to grind the stump out yourself, keep in mind these machines are large and can be difficult to transport and operate. A more affordable way to remove a tree stump is to use potassium nitrate pellets to accelerate decomposition, which can take four to six months.