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To prepare your yard for river rocks, smaller rocks may require laying landscape fabric to keep the stones from sinking into the ground while encouraging proper water drainage. You should also clear the land of weeds and larger boulders and, in some cases, test the density of the soil to ensure it can handle the weight.

Colored mulch can be bad for plants in that it robs them of nitrogen as it depletes the soil to break itself down. With this in mind, it’s a good idea to test your soil to check the nitrogen levels. If the nitrogen levels are low, use fertilizer with extra nitrogen or switch to regular mulch.

Another downside of colored mulch is if it’s heavily contaminated, it can contaminate the soil and damage your plants. To avoid this, look for the MSC certification logo on the mulch bag before purchasing.

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.

Mulch is made from natural materials, which will break down and add nutrients to your soil for better plant and soil health, so removing old mulch is unnecessary before putting down new mulch. However, if you live in a particularly moist area, it’s possible that the old mulch will harbor fungus or mold, which can hurt plant health. If you notice these issues, you might want to consider removing the old mulch first. Otherwise, save time and money by placing new mulch right over the old mulch.