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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.

You should use mulch because it protects garden soil in a few key ways. This extra layer between the ground and the elements protects against erosion, helps your soil maintain moisture, regulates changes in temperature, adds nutrients as it decomposes, and keeps weeds at bay.

Yes, weeds can still grow in decomposed granite. If properly compacted, it can act as a good weed suppressant, meaning you’ll only pull weeds occasionally. But no ground cover is completely weed-proof. To further prevent weeds, you can try spraying your decomposed granite with distilled white vinegar.

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.