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While a river may seem safer than the street, blowing leaves into the water can cause a lot of problems. Leaves can alter the local ecosystem, encourage bad algae growth and block narrow waterways. In large numbers, leaf debris can lead to fish death events in nearby bays or lakes and require expensive dredging to address. That’s why many cities also ban blowing leaves into water.

Your neighbor is not in a good position to know if your trees are truly dead or pose any kind of danger. That’s why hiring an arborist or tree service expert can be such an important part of the process. If the trees are still alive and don’t pose any threat, you’re in the clear (but you may want to document and photograph everything in case events turn sour down the road).

But if a tree is visibly dead and near the property line, you should remove it to be safe. If a dead tree falls on a neighbor’s property, they may have grounds to sue for negligence. If any branches on trees have died, it’s a good idea to cut them back for similar reasons.

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.