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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 depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.

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.

As a base, you should use a fertilizer with a 5-5-5 NPK ratio (5% nitrogen, 5% phosphorus, and 5% potassium). You may need a different ratio depending on what your soil is lacking, but a soil test can help determine the perfect amount.