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As a base, you should use a fertilizer with a 5-5-5 NPK ratio (5% nitrogen, 5% phosphorus, and 5% potassium). You may need a different ratio depending on what your soil is lacking, but a soil test can help determine the perfect amount.

Pea gravel consists of many small, rounded stones that, unsurprisingly, kind of resemble peas. They range in size from 1/8 to 3/8 of an inch. Higher-end products might be a little more uniform and have fewer jagged rocks in the mix.

Stump grindings are usually safe to use in soil, but in some cases, it’s not recommended. Wood chips in particular can bind nitrogen in the soil, which will make it difficult for grass to grow. That’s why it’s important to remove most wood chips and use healthy garden soil if you want to cover the stump spot with grass. Large wood chips may attract beetles and could encourage the growth of fungi when they decay, so you may want to remove them when using the grindings.

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.