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You need to put shock-absorbent material under artificial grass. While it will depend on where exactly you’re placing artificial grass, there are a few different options you could use such as silica sand, granite sand, astro-cushion, weed membrane, and geo-textile paper.

Pea gravel is a type of gravel that is generally smaller and rounder than regular gravel. It's usually made from river rock and is available in a wide range of colors. Thanks to its soft, round shape, pea gravel is more comfortable to walk on compared to standard gravel, which can have sharp edges. A drawback of pea gravel is that it can scatter more easily than other gravel types.

You shouldn’t put topsoil over new grass seed. Even though it may seem like this would increase soil contact and help the seeds grow, adding more soil overtop of planted grass seed will only make it harder for water and oxygen to reach the grass seeds. If you want to protect the grass seeds, consider adding a thin layer of organic matter, such as straw or hay.

Hydroseeding is a great option for sloped yards, as sod might not root as well. Hydroseeding also traditionally creates sprouts faster than normal seeding—up to a full week faster. Additionally, you can customize your slurry mix with hydroseed, allowing you to create a mixture that will work specifically for your yard’s conditions. 

It’s important to remember that hydroseeded lawns require a lot of water during the first few weeks of installation, which can be time-consuming and costly. Additionally, the installation window tends to be shorter than that of sod and traditional grass.