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Yes, you can lay pea gravel directly on the dirt. First, dig a trench 2 to 6 inches deep the length and width of the area you want to cover. Plants and weeds will eventually grow through the pea gravel if you don’t lay down landscaping cloth.

Keeping your gravel driveway beautiful—or any gravel structure for that matter—does call for regular maintenance. You may occasionally need to add more gravel to low areas if you notice any pooling after rainfall. Gravel might also become excessively dusty over time. You can compact it with a mechanical compactor, which you can rent for around $80 to $85 per day.

To minimize maintenance requirements for your gravel, it’s important to ensure your land is properly graded before installing the gravel. It’s also helpful to lay landscaping fabric beforehand to keep it in place.

The best size rock for your landscaping depends on the design, as different boulders serve different purposes. If you want to group boulders to create a natural-looking cluster, you’ll need a range of sizes. Otherwise, here are some suggestions:

• Small boulders (smaller than 12 inches across): Best for landscape edging and fire pits 

• Medium boulders (12–24 inches): Best for retaining walls and water features

• Large boulders (more than 24 inches): Best as standalone landscaping features, steps, or walkways.

Of course, you can mix and match sizes to create a unique display.

The best mulches for trees are wood chips, bark nuggets, or pine straw. Depending on your goals, you may want to avoid using plastic, stone, rubber, or wet grass clippings. Plastic mulch prevents water from reaching the mulched areas of your tree, stones don’t offer any nutritional benefits to the soil, rubber can release byproducts into the soil when it decomposes, and wet grass clippings can lead to rot. 

Plastic may prove beneficial in cold climates in the winter, but wood chips are the ideal option for most environments.