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You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

Yes, you can put new mulch over old mulch, since it’s decomposable. The only reason you should remove old mulch before laying new mulch would be to maintain a certain aesthetic. 

The ideal amount of mulch is the square footage of your desired depth in inches divided by 324. Aim to keep your old and/or new mulch at a depth of no more than three or four inches.

Key considerations include dust control, soil erosion prevention, and protecting local wildlife habitats through sustainable clearing practices.