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A base layer is typically required when installing artificial grass, and the specific materials depend on the surface where the turf is being placed.

If you are installing artificial grass over soil, you should lay down a sub-base and a weed barrier.

• Weed Barrier: A fabric weed barrier, weed membrane, or geo-textile paper is essential to prevent weeds from growing through and damaging the turf.

• Sub-base: This layer provides drainage, support, and prevents the turf from sinking. Common materials include a mixture of gravel and sand, such as crushed miscellaneous base (CMB), decomposed granite, decomposed limestone, or a specifically mixed road base. Other options include silica sand and granite sand.

If you are placing turf over a hard surface like concrete, you can often skip the sub-base and use a padded underlayment or shock-absorbent material like astro-cushion for comfort and safety.

If you are unsure which materials are best for your specific project, it's a good idea to consult with an artificial turf installer.

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.

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.

The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.