Soil erosion, weeds, and even pests can't compete with a thick layer of cedar mulch. Just like the moth-repelling cedar blocks you keep in your closet and dresser, cedar mulch has the ability to naturally scare off certain types of pests. When applied to garden beds, it can help retain moisture but without causing your garden to overheat, as can happen with synthetic mulch. And because this heavy bag of mulch is delivered right to your door, you'll need to do very little heavy lifting to add it to your landscaping. Available on Amazon; $9.00.