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While organic mulch offers many benefits, it can also attract bugs looking for shelter, food, and water. Insects, rodents, snails, and slugs are often attracted to its decomposing material.

If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.

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.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.