How much mulch is too much?

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There is such a thing as too much mulch, especially grass clippings.

Mulch can get matted and prevent water from penetrating the soil, it can also harbor pests.

Grass is particularly prone to getting matted. Also early spring grass clippings are good, but later ones can be full of seeds, and you don't want that. Also, grass, if thick, and freshly cut, and laid down, can get super heated and even start to smoke in the summer, the heat from such hot composting could damage your plants.

And to add to that. If you fertilize your lawn to get that lovely green, you will be adding way too much nitrogen to your veggies. Too much nitrogen, and you will have really nice green plants with no fruit production.