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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.

It takes anywhere from three to seven years for a stump to decompose on its own. This timeframe can depend on the kind of tree and your climate. The lower to the ground the stump is, the faster it rots. If you kill a tree stump with salt, boiling water, herbicide, light deprivation, or burning, the tree stump decomposes faster. 

You may be looking to identify maple trees to use for home improvement projects. In that case, you can tell hard maples by looking at their leaves. Leaves will have a U-shaped dip, or sinus, between the points, or lobes, of the leaves. Leaves of soft maples tend to have V-shaped sinuses.

If you already have the cut wood in front of you, look for a light, uniform color to identify hard maple wood and check for variations of red, gray, or brown streaks and an overall darker color in soft maple wood.

The ideal time to prune a tree depends on the type of tree. Typically, late winter or early spring is a good time to prune but isn't always the case for "towering trees." It's best to trim when trees are dormant and before blooms appear but can vary depending on the tree type. It's always best to research the type of tree or ask a professional tree trimmer to determine when is the perfect time to prune your tree.