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Yes, you can put soil on top of existing grass to level small areas. This is helpful for filling in small divots or leveling out minor dips in your yard that collect rainwater. However, this isn’t a good option if you need to regrade your entire lawn. It’s better to have a professional excavate some of the dirt first so that the level of the lawn doesn’t rise too high.

While they’re popular and have a lot of pros, the cons of river rocks include the following:

• River rocks don’t break down or provide nutrients to plants. 

• These stones can get hot and scorch nearby plants. 

• River stones may heat the surrounding soil to inhospitable temperatures. 

• Rocks can block rainwater from seeping into the ground if installations are too thick or tightly packed.

Most downsides occur when using river rock as mulch in gardens and flower beds. However, you can still incorporate river rocks into your landscape as long as you use them in the correct ways.

If you’re mulching in the fall, aim to lay down the material right after the first frost, which will vary by climate. Late October and early November are good time ranges to aim for. Try to lay down your mulch after a light rainfall to lock in moisture for root growth through the winter.

Determining how many boulders you’ll need for your landscaping project depends on the area you need to cover and how big each boulder is. First, you’ll need to determine how big of an area you want covered, then divide that by the base surface area of the boulders. A landscape professional can help you determine how many boulders will be right for your project.