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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. 

While you don’t need to put anything down before mulch, you can apply a pre-emergent herbicide to prevent weed growth. As long as you remove weeds before you spread mulch, you should be in the clear. But a herbicide is something that you can put down before mulch as an extra layer of protection.

Leaf removal isn’t usually necessary, and in fact, leaving leaves where they fall or mulching them instead can provide nutrients to your soil that can be good for your lawn and garden beds. Most homeowners prefer the look of a lawn that is neat and clean, though, so the majority of people prefer to pay for leaf removal. There are some cases where you might have to pay for leaf removal, like if you live in a strict homeowners association that mandates the service or a generally clean lawn.

It’s possible to over-mulch leaves. If the leaf mulch is thick enough that it’s blocking and smothering the grass, that’s a problem. Ideally, you should still be able to see the grass when you’re done mulching to ensure its ability to continue growing. The solution is to make another pass at the top layer of leaf mulch to collect some of the top layer.