Rubber mulch is a landscaping material made from shredded and chipped recycled tires. Organic mulches break down over time, but rubber mulch is a long-lasting solution for garden beds, playgrounds, and other outdoor areas. Because it comes in various colors, you can match current landscaping to a rubber mulch product. Like traditional mulch, rubber mulch comes in large bags and bulk quantities. But is it the right choice for every garden? Find out in our guide.
Benefits of Rubber Mulch: A Low-Maintenance Way to Protect Plant Roots
Several characteristics of rubber mulch make it worth busy gardeners to consider.
1. Requires Little Maintenance
The most significant plus of rubber mulch is its longevity. Organic mulches like wood chips or pine straw need regular replenishment, and you may haul bags of cedar bark from the garden center to your house annually. Rubber mulch, however, lasts for years with minimal upkeep.
Many rubber mulch brands maintain their appearance and effectiveness for at least a decade. This durability means you’ll spend less time and money on annual mulch replacement. That’s appealing.
2. Won’t Drift Away
If you live in an area that experiences severe weather, you’ll appreciate how rubber mulch helps maintain a consistent layer of protection for plant roots. Its weight means that it mostly stays put through flooding or strong winds, giving it a slight edge over lighter, organic alternatives that may need frequent raking and redistribution. However, organic options look more natural in most landscape settings.
3. Doesn’t Attract Pests
Wood-based mulches can attract termites, carpenter ants, and other wood-boring insects, but rubber mulch is unappealing to these pests. That makes rubber mulch a safer option to place near home foundations and outbuildings, potentially reducing the need for pesticides and lowering the risk of structural damage from wood-eating insects.
4. Insulates Well
Rubber mulch insulates soil, which protects plant roots from temperature extremes in summers and winters. This insulation maintains more consistent soil temperatures, which can be beneficial for plant health and growth and increases the odds that your perennials will return each year. However, if you live in a hot climate, you’ll want to choose lighter-colored rubber mulch to avoid overheating the soil.
5. Inhibits Weed Growth
While it doesn’t have the same long-term effectiveness as some organic mulches, rubber mulch can play a role in weed control. Put down a layer of 2 to 4 inches for optimal weed suppression. Because rubber mulch won’t prevent seeds already in the soil from germinating, you must weed the ground thoroughly before spreading rubber mulch.
To really control weed growth with rubber mulch, you’ll need a layer of at least 2 inches and preferably at least 4 inches. Rubber mulch won’t hinder seeds and young weeds already in the soil, so remember to weed or till the soil thoroughly before you spread the rubber mulch.
6. Improves Safety in Play Areas
The density and resilience of rubber mulch provide a softer landing surface for children, potentially reducing the risk of injury from falls. A layer of at least six inches works best for effective shock absorption. Also, rubber mulch doesn’t stain clothes or give kids splinters like wood mulch. Kids won’t track bits of rubber mulch into the house, either.
Disadvantages of Rubber Mulch: High Purchase Costs and Potential Soil Contamination
Despite its benefits, rubber mulch has several drawbacks that gardeners should consider.
1. Costs More Upfront
The initial cost of rubber mulch is significantly higher than that of organic alternatives. First, you have to factor in the price of landscape fabric to put down underneath the mulch. Second, rubber mulch brands cost more than $6 per cubic foot, with some premium options reaching up to $12 per cubic foot. While the long-term durability of rubber mulch partially offsets these costs over time, the high up-front investment might not fit your budget.
2. Can Release Harmful Metals and Chemicals
Environmentalists take note. Rubber mulch can leach chemicals and heavy metals into the soil. This hazard represents a stark contrast to organic mulches, which are biodegradable and add nutrients to the soil as they break down.
In addition, when exposed to heat and sunlight, rubber mulch can release volatile organic compounds (VOCs), which may create unpleasant odors and potentially harmful health effects. What’s more, as it breaks down, the artificial mulch can introduce metals like zinc, aluminum, and cadmium into the soil, potentially harming plants and contaminating groundwater.
3. Poses a Minor Fire Hazard
The petroleum content in rubber mulch means that it’s more flammable than organic mulches. When ignited, it burns hotter and faster. Flames are hard to put out, and they produce thick, toxic smoke. While the risk of spontaneous combustion is low, caution exercise caution when using rubber mulch around areas where open flames or heat sources are present. Don’t spread it near your firepit, barbeque grill, or smoker.
4. Difficult to Remove
Once you’ve put it down, rubber mulch is challenging to remove or replace. Small pieces often mix with soil, making it nearly impossible to separate without completely removing the soil’s top layer. Tilling isn’t an option, so gardeners who use rubber mulch can plan on manual weed control.
What Is Rubber Mulch Good For?
Rubber mulch owners of certain outdoor areas may consider using rubber mulch for:
- Playgrounds and recreational areas to ensure safety
- Low-maintenance landscaping and weed control around mature trees and shrubs
- Areas prone to erosion or flooding where you need more mulch stability
However, because of potential chemical leaching, plant experts don’t recommend it for vegetable gardens or areas with delicate plants.
Rubber Mulch for Pathways
Rubber mulch is also worth considering for garden pathways as long as the pathways aren’t near plants. The mulch doesn’t need frequent replacement, and it will stay in place with heavy foot traffic. Unlike a rock pathway, it won’t lead to a skinned knee if a running child trips. Plus, rubber mulch doesn’t get as muddy or slippery as stones or bricks, making it a safer choice for walkways.
Rubber Mulch for Commercial Properties
Commercial landlords have also adopted rubber mulch because of its low maintenance and longer lifespan. Businesses, schools, and public parks have started using rubber mulch in landscaping to save money on replacement and maintenance costs. Staffers can focus on other tasks.
Using Rubber Mulch with Landscaping Fabric
To get the most out of your rubber mulch, put down landscaping fabric beneath it. The additional layer helps prevent weeds from growing through and provides extra stability. If you decide to replace the mulch several years later, it also makes the cleanup process easier. When installing the fabric, ensure that it’s properly secured and overlaps to fully cover the soil beneath.
Final Thoughts About Rubber Mulch
Ultimately, whether or not you decide to put down rubber mulch requires weighing its pros and cons and looking at your outdoor space. What are your specific landscape needs, what types of plants do you grow, and what are your long-term goals? You may decide to mix mulches, putting down rubber mulch around a swingset but an organic mulch near your vegetable garden. With so many options for mulch, you’ll be able to protect every part of your landscape.
