What Type Of Mulch Should I Use?
Choosing the Right Mulch
There are lots of options when it comes to covering the soil in your landscape beds. They generally fall into a few categories, including organic mulches, inorganic materials such as rock, and synthetic products.
Each has its own advantages and disadvantages, so the best choice depends on your landscape, the plants you’re growing, your budget, and the look you prefer.
Organic Mulches
Organic mulches are made from plant materials that gradually break down. As they decompose, they can add organic matter and help improve soil structure over time.
• Natural Wood Mulch – Made from different types of wood and bark. It provides a finished look, helps conserve soil moisture, moderates soil temperatures, and gradually decomposes.
• Cedar Mulch – Cedar mulch tends to break down relatively slowly compared with some other wood mulches. Shredded varieties can knit together after installation, which may help them stay in place better during rain and watering.
• Hardwood Mulch – Usually made from hardwood bark and wood material. It’s a popular and economical choice, although it will gradually decompose and need to be refreshed.
• Dyed Mulch – Available in several colors and often made from recycled or processed wood. Quality can vary, so choose mulch from a reputable source. The color will eventually fade, and the material will gradually break down.
One common misconception: wood mulch sitting on top of the soil does not normally “rob” established plants of nitrogen. Some temporary nitrogen use occurs where wood is actively decomposing in contact with the soil, which is one reason we recommend using wood chips as a surface mulch rather than mixing large amounts of fresh wood material directly into the soil.
• Cypress Mulch – Cypress is another long-lasting wood mulch option. If environmental impact is important to you, look for products that provide information about how and where the material was sourced, since sustainability can vary by producer.
Pine Straw
Pine straw is readily available in East Texas and is another popular organic mulch.
Pros: Pine straw is lightweight, easy to spread, and often relatively inexpensive. Once it settles and interlocks, it can stay in place surprisingly well on slopes and around established plants.
Cons: Because individual needles create a more open layer than finely shredded mulch, weed suppression depends heavily on applying and maintaining an adequate depth. Pine straw also decomposes and settles over time, so it will need to be replenished.
Like other dry organic landscape materials, pine straw can burn, so consider fire safety when using it immediately next to structures, grills, fire pits, or other ignition sources.
Gravel & Decorative Rock
Gravel and decorative stone don’t decompose like organic mulch, making them a long-lasting option for certain areas of the landscape.
Pros: Rock doesn’t need to be replenished because of decomposition, is resistant to wind, and can provide a clean, decorative look. It’s especially useful in landscapes featuring plants that prefer excellent drainage and drier conditions.
Cons: Rock absorbs and radiates heat, which can increase temperatures around plants during our hot East Texas summers. This can be especially stressful for plants that prefer cooler root zones or afternoon shade.
Rock also doesn’t eliminate weeds. Soil, leaves, and other organic material eventually collect between the stones, allowing weed seeds to germinate.
Landscape fabric is sometimes installed underneath rock to help separate it from the soil and slow weed growth. If used, choose a water-permeable landscape fabric and understand that it won’t permanently prevent weeds. Avoid placing impermeable plastic beneath planted beds where it can interfere with water and air movement.
Synthetic Mulch
Rubber mulch is one of the most common synthetic mulch products and is often made from recycled tires.
Pros: It decomposes very slowly, doesn’t need to be replenished as frequently as organic mulch, and can provide a consistent appearance for a long period of time.
Cons: Rubber mulch doesn’t add organic matter to the soil as it ages. It can also absorb and radiate considerable heat, and because rubber is combustible, it isn’t the best choice where fire resistance is important.
Once rubber pieces become mixed into the soil, they can also be difficult to remove. For planted landscape beds, we generally prefer materials that support the long-term health of the soil and plants.
So Which Mulch Is Best?
There’s no single material that’s perfect for every landscape. For most traditional flower beds containing trees, shrubs, annuals, and perennials, an organic mulch is a great all-around choice because it conserves moisture, moderates soil temperatures, suppresses weeds, and contributes organic matter as it breaks down.
Whichever material you choose, apply it correctly. For most landscape beds, approximately 2–3 inches of mulch is plenty, and always keep mulch pulled back from tree trunks, shrub stems, and plant crowns rather than piling it against them.
There are pros and cons to every type of mulch. Choose the option that best fits your plants, your landscape, and the way you want your garden to look!