Can Pea Gravel Be Put Over Mulch?

Advantages of Mulch

• "Mulch" is a broad term that refers to both organic and inorganic materials applied over soil. Organic mulches include wood chips, bark nuggets, pine straw and composted grass and sticks. The materials compact to insulate plants and conserve moisture in the ground. Most organic mulches do not float away or scatter. While they break down over time and need to be replenished, they add nutrients into the soil.

Advantages of Pea Gravel

• Pea gravel adds a finished look to new garden beds. Composed of round, smooth stones that measure about 3/8 of an inch, peal gravel is a long-lasting, strong material. The hard rocks add contrast to delicate flowers and tall, slender stems. Pea gravel is inexpensive and low-maintenance. It also blocks weeds, retains moisture and insulates plants.

Considerations

• Organic mulches improve soil by adding nutrients and minerals. Pea gravel offers a water-permeable surface that works well as ground cover or a garden pathway. Avoid spreading pea gravel on steep slopes, as it doesn't compact due to its shape. Consider the health of your soil before adding pea gravel to a garden. It is difficult to remove, making it challenging to add compost in the future.

Application

• Consider the height of the mulch before you add pea gravel on top. If the bed already sits about 2 inches from the ground, adding pea gravel increases the height of the garden even further. Depending on the thickness of the mulch, lay a 2- to 4-inch layer of pea gravel over the top and spread with gloved hands, leaving the base open around each plant. To prevent the rocks from floating away or scattering in your lawn, install edging restraints around the perimeter.