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The best soil to put around a house foundation is fill dirt, which is soil that’s specifically designed for covering large areas and filling in holes. Don’t waste money regrading around your foundation with expensive topsoil. Use topsoil only for the last layer of soil, about 5 to 10 inches, so that when you do your foundation planting, your grass and plants will have the nutrients they need to grow.

You can choose from various kinds of organic mulch and inorganic mulch. Organic mulch may be in the form of wood chips, pine needles, and compost and eventually decompose. Inorganic mulch, such as gravel, rocks, and landscape fabric, is more durable but doesn’t help the soil.

Pea gravel is the most common type of gravel, and it can be made of limestone, granite, basalt, sandstone, and many other types of rock. The strength in gravel comes from the distribution across the stones, so while one rock type may not be particularly strong (like sandstone), the matrix of small rocks that is gravel can become incredibly strong when installed correctly. 

If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.