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.

Pruning trees during the summer can be a bad idea because the new growth will take place during the hottest months of the year, which can stress your tree out. Similarly, pruning during the early fall can be a bad idea, too, because you’d be stimulating new growth when most trees are aiming to go dormant. 

Pruning recommendations will vary by the type of tree, but generally, waiting until winter to prune your trees is a good idea.

Salt, herbicide, light deprivation, boiling water, and burning can all help dissolve a tree stump. You can also bury the tree stump in soil or mulch to help it rot naturally. Killing a tree stump prevents future regrowth, but you may also remove it by digging it out or grinding it.

Unfortunately, palm tree stumps are one of the most difficult types to remove due to how their roots grow. Unlike other trees, palm tree roots grow horizontally and vertically. Palm tree roots grow as deep as three feet into the ground, although soil and growing conditions could mean they go as far as 50 inches into the earth. 

If you want to be able to repurpose the grass in the area where you removed a stump later, you’ll have to dig quite deep—and perhaps wide—to trim away all the roots.