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Organic mulch typically lasts between 4 to 6 years. However, factors like the type of organic mulch you choose, mulch size, and weather conditions can all play a role in its longevity. In some cases, you’ll need to replace organic mulch every few years.

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 number of bags of topsoil you need depends on the depth you’re filling. The average topsoil is sold in a roughly forty-pound bag, covering 12 square feet at a one-inch depth. Since topsoil is by nature the uppermost layer of soil, you can bet on only needing to fill about 4 to 8 inches of soil depth with it.

Yes, you need to use landscape fabric under your rubber mulch. Rubber mulch doesn’t decompose, so putting landscape fabric down can work as a barrier between your mulch and soil, preventing your mulch from mixing with your soil and leaching chemicals like aluminum, cadmium, and copper into it. Also, since weeds can occasionally get through rubber mulch, using landscape fabric as a second form of protection can increase its effectiveness.