Gravel and Stone Mulches

In certain situations where organic mulches are impractical, gravel and stone can be the answer.

With these mulches, the first thing to consider is their appearance. While they’re perfectly suited to western landscapes, they can look out of place in some eastern settings. However, there are certain exceptions, particularly with respect to gravel gardens. A well designed gravel garden is suitable for all areas.

Advantages of Stone and Gravel Mulches

Gravel and stone mulches offer several advantages. They conserve soil moisture and deter weeds. These also protect the soil from erosion.

Because these mulching materials absorb and store heat, the soil will stay slightly warmer than it normally would. During the winter, this can be desirable for plants that are sensitive to extreme cold. Larger pieces of mulch tend to retain heat better than crushed stone and pea gravel.

Once they’re in place, these mulches tend to be permanent. Removing them would be a painstaking job.

While bark and other organic mulches decay over time and need replenished occasionally, stone and gravel are a care-free alternative.

For Mediterranean-type plants and herbs that require perfect drainage, stone and gravel mulches are the preferred choice. Organic materials keep the crowns of these plants excessively moist.

Factors to Consider

Keeping its permanence in mind, plan very carefully when choosing these mulches. They will be a prominent feature in the landscape for years to come.

Consider their decorative appeal when selecting a color and size. Depending on the circumstances, a pure white might be so dazzling that it looks artificial.

Applying gravel and stone mulches is no easy task. It requires time and effort. This material is heavy.

Cost also plays a role. Initially, this material is expensive. Unlike bark and organic mulches, this is a one-time expense.

The more decorative types can cost much more than ordinary ones. The choices include crushed marble, marble chips, decomposed granite, crushed rock, and pea gravel.

If you’re covering a large area, buying bags of stone becomes impractical. In those situations, have a bulk load delivered. Choose a spot where the truck can dump its load. If possible, locate this close to the area where the mulch will be spread.

Maintaining Stone and Gravel Mulches

Though these are generally maintenance-free, there is one exception. Some light colored gravel and stones are easily stained. For that reason, spread a piece of plastic over the area when you’re digging in the bed. As you dig, place the soil on the plastic to prevent stains.