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Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

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.

Buying topsoil in bulk or a bag depends on how much area you’re trying to cover. Even if it goes on sale, bagged topsoil isn’t as cheap as buying it in bulk, but transporting bulk topsoil can become cumbersome if you don’t have the proper truck. If you can find an easy delivery option and have the space to store a large amount of topsoil, buying in bulk will give you more bang for your buck.

When it rains, decomposed granite can become muddy and mushy in texture and start to wash away, leading to erosion of the surface. Decomposed granite’s inability to endure heavy rainfall is one of its biggest drawbacks.