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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.

A standard home lawn mower with sharp blades can handle a thin layer of leaves without issue. You may need to make a couple of passes within several days to mulch leaves down, but your mower shouldn’t struggle. If your mower comes with a mulching kit, like an attachment to blow leaves out the side, that’s a good sign it’s ready for fall leaves. Set your mower to the highest or near-highest height for this project so it focuses on the leaves rather than the grass below.

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.

Ultimately, pulling weeds vs. spraying them depends on what’s happening in your yard and your personal preferences. Manual weed removal doesn’t introduce any chemicals into your landscape, targets specific problematic plants, produces immediate results, can be free if you go the DIY route, and is inexpensive with a weed service if you only have a handful of weeds. On the other hand, spraying is often preferable for severe weed infestations and situations involving difficult-to-pull weeds because it treats multiple weeds at once, is usually more effective long-term, is less time-consuming, and costs less when done by a pro.