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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.

Generally, it is not necessary to remove old mulch before applying a new layer. As organic mulch breaks down, it enriches the soil with nutrients. However, you should remove the old layer if it shows signs of fungus or disease, which can be common in moist areas, or if the total depth is already too thick. Avoid letting the total mulch depth exceed 3 inches, as this can harm plant roots. If you do remove old, disease-free mulch, it can be added to a compost pile.

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. 

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.