Both organic mulch and rock beds can add an aesthetic curb appeal to any landscape or yard. They are both used to cover bare patches in soil beds and the soil around trees, to prevent soil erosion. Both types of garden beds look great, so whichever type of mulch you decide to use in your yard is often a matter of personal preference. Most purists prefer the look of natural mulch, especially in curvy beds brimming with seasonal flowers and perennials. Meanwhile, other gardeners prefer the clean, modern, bright look of rock mulch which accentuates the straight lines of a modern garden. So, which is better for your landscaping, rocks or mulch?

Which Is Better: Rocks or Mulch?

Organic mulch

Organic mulch is typically made from either tree or plant bark and is 100% natural. Bark from pine trees, cedars, oak, cypress, and hemlock are commonly used. If you feel inclined, you can even make your own organic mulch.

In addition to preventing soil erosion, which happens when soil is bone dry and blows away, mulch is a valuable source of soil nutrition and soil water retention. Furthermore, soil blocks out the light, thus making it difficult for weeds to sprout and grow.

There are also non-organic bark mulches available that have been colored to achieve a year-round dark, rich look. Given the natural properties and practical benefits of natural mulch, you can never go wrong with this choice. Mulch does of course break down over time and becomes compost, and feeds the soil. This means that you will need to replace the mulch, which will take time and labor, and money, if not making your own.

Rock mulch

The rocks sold as rock mulch typically come from river beds and are available in many different sizes. Rock mulch sizes range from pea-size to marbles to golf ball size and come in all sorts of natural shapes. Though rock mulch is porous, and water passes through it, it is used primarily for decoration.

While rock mulch is available in its natural color, it is commonly artificially colored. There is a variety of rock mulch to choose from including black lava rock and quartz. The initial outlay cost for rock mulch will be greater than the cost of organic mulch. Once it has settled, rock mulch may also need a top-up layer. In terms of maintenance, you will need to occasionally wash the rocks to keep them looking good.

Landscape considerations

Rock beds are a very good idea for yards with poor drainage as the rocks allow the water to drain quicker. Rock mulch is also great for covering large bare areas where grass doesn’t grow as it requires little maintenance. It can be turned into a feature. In addition, rocks are an excellent platform and backdrop for fountains and water features. Another excellent use of rock mulch is in high-traffic areas. This is particularly true of residential developments, where residents ignore designated paths and cut through flower beds.

Additional Reading: About Landscape Fabric (UNL Extension)

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