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You should exercise care when deciding how to landscape over a leach field for your septic system. You typically want lightweight materials that won’t damage the drain field’s perforated pipes. When adding plants to the area, select plants with shallow roots, such as grass or flower gardens. Trees with deep roots could damage the pipes in the field.

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.

The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.

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.