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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.

According to the College of Agriculture and Life Sciences, there are over 10,000 kinds of mushrooms, and some are harmful to both humans and animals. However, not all mushrooms are harmful—some feed on thatch and wood, which provides nutrients for grass and plants. 

But unless you’re a mushroom expert (mycologist), it can be hard to tell poisonous mushrooms from non-poisonous. So if you have kids or pets (or both), removing them is the safest route to take.

Foxtail grass is not native to the United States, so it is considered an invasive plant. Giant foxtail originated in eastern Asia, Green foxtail is native to Europe, and Yellow foxtail is native to Eurasia. This grass variety is one of many common invasive plant species that you should keep out of your yard and garden beds as much as possible.

No, it’s not necessary to remove all the leaves from your lawn—in fact, leaving some behind can be beneficial. While it's important to clear thick layers of leaves that can smother your grass, leaving a light scattering of leaves can help feed your soil while also providing safe winter habitat for pollinators like bumble bees. Leftover leaves will eventually break down, enriching the soil and promoting healthy lawn growth.