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There are a few factors to consider when choosing the right size river rock for a landscaping project. First, think about how you’ll use the rocks. For example, if you’re installing them as part of a water feature, medium-sized stones (ranging between 2 and 5 inches) often work best. Smaller rocks (from 1 and 3 inches) are better for walkways and pathways, while a mix of medium and large stones (between 3 and 8 inches) is ideal for garden beds.

Although it’s not required to lay anything under mulch, it can help to put landscape fabric or plastic weed barrier down and lay mulch on top. The barrier helps keep weeds from growing up through your mulch. It also helps keep rodents and insects from burrowing into the ground underneath.

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.

If you have a lot of trees around your home, mulching all those leaves can smother the lawn. Air and light won't reach the grass and soil if too many leaves have been mulched. Turf grass and other lawn problems can arise if the weather is too wet and excessive leaves have been mulched.