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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.

We always recommend wearing a protective mask when blowing leaves (as well as goggles if possible). Blowing leaves creates a lot of dust, and in many cases that dust contains a bunch of allergens that can make those sensitive very miserable. Even worse, moldy leaves can contain fungi and bacteria that could make humans as animals very sick. Mask up before starting your leaf project, and if anyone is helping you collect the leaves it’s a good idea if they wear a mask, too.

It may sound icky, but yes, urine encourages microbial activity that breaks down organic matter faster. It’s rich in nitrogen, which helps balance carbon-heavy materials like dry leaves or straw. Use sparingly and apply it to a well-balanced pile, not one already high in nitrogen.