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It can be bad to leave a dead stump in the ground. A stump becomes a hefty piece of dead wood in time and eventually (especially with the help of rain) starts to rot. That makes it a locus point for diseases and pesky insects, as well as a bit of an eyesore. It’s best to remove a tree stump completely before it starts to decay, especially before it starts to fall apart. If the tree was removed because of disease, it’s even more important to fully remove the stump if possible.

Yes, it's perfectly safe and environmentally sound to mulch leaves with a lawn mower, provided that the layer of leaves isn't too thick and the leaves are dry and crispy. Too many wet leaves get sticky and will clog the mower. Thick layers of leaves can suffocate the lawn after the leaves have been mulched, so the layer should be no more than six inches thick.

It’s unlikely your leaves are a hazard, especially if you get to them while they’re dry. However, a couple of rare risks exist. University studies suggest that decaying leaves can produce organochlorines, toxic pollutants similar to man-made PCBs (polychlorinated biphenyls), so avoid keeping them in an enclosed area.

Also, leaves and compost may cause the growth of fungi that can cause diseases like histoplasmosis and aspergillosis, as well as mold spores that are unhealthy for human lungs. Again, severe issues are rare, but those with compromised immune systems or allergies to mold should wear face masks when directly handling leaves.

Dawn dish soap is typically too abrasive to use on plants, even when diluted with water. The soap contains detergents that can strip away a plant's natural waxes and oils, which are there to protect the leaves.

Should you decide to make your own soap spray insecticide, it's important to choose a gentle soap that doesn't contain detergents or surfactants. Castile soap, such as Dr. Bronner’s, is a good pick.