Should You Use Landscape Fabric Under Mulch (Weed Barrier)?

If you’re a gardener or landscaper, you may have heard of landscape fabric. But is it really the best aid when it comes to mulching? Know the answer to the question, “Should I use landscape fabric under mulch?”

Landscape fabric under mulch serves to inhibit weed growth and retain soil moisture. It provides a barrier, preventing weeds from penetrating the mulch layer. However, it can impede beneficial organisms’ access to the soil and hinder nutrient cycling. Consider soil type and garden goals when deciding, as landscape fabric can offer benefits in certain situations but may not be universally necessary.

In this article, we’ll discuss the pros and cons of using landscape fabric under mulch and explore alternative options. By the end, you’ll be equipped with the knowledge to make an informed decision based on your specific needs and goals.

Key Takeaways

  • Landscape fabric can be an effective weed barrier but has potential drawbacks.
  • Pros of using landscape fabric include weed control, improved organic matter retention, and protection of plant roots.
  • Cons of using landscape fabric include potential harm to flower beds, limited lifespan of the fabric, and impact on organic materials.
  • Alternative options include grass clippings, garden staples, rubber mulch, black plastic, and wood mulch.
  • Consider soil moisture and the type of mulch when deciding on the best weed control solution.

Pros of Using Landscape Fabric Under Mulch

Using landscape fabric under mulch can be a good idea for maintaining a healthy garden. Here are some potential benefits:

  • Weed Control: Landscape fabric can help in controlling the growth of weeds by blocking their access to sunlight and other essential nutrients.
  • Improved Organic Matter: Landscape fabric can improve organic matter retention in your soil by preventing it from washing away during heavy rains.
  • Protected Plant Roots: Landscape fabric can protect the roots of your plants from exposure to harsh environmental conditions, such as extreme temperatures or pests.

In addition, the use of organic matter-rich mulch over the landscape fabric, such as shredded leaves or grass clippings, can further benefit your flower beds by adding nutrients and aiding in moisture retention. However, it’s important to note that excessive use of wood chips or thick layers of mulch can impede oxygen and water movement, leading to unintended consequences for plant roots and weed growth.

Overall, using landscape fabric under mulch can be a good idea for weed control, organic matter retention, and plant root protection, when used in moderation.

Cons of Using Landscape Fabric Under Mulch

While using landscape fabric under mulch has its advantages, it also has several drawbacks that are worth considering before making a final decision. These include:

1. Impact on Flower Gardens

Landscape fabric can negatively impact the health of flower gardens by reducing air and water flow to the plants. It can also prevent plant roots from spreading and reaching nutrients in the soil. Flowers may also become stunted and not reach their full potential due to lack of space to grow.

2. Decomposition Over Time

Landscape fabric typically lasts for only a couple of years before it starts to degrade and break down. As it decomposes, it can become matted and form a barrier to water and air, causing plants to suffocate and die.

3. Limitations Related to Organic Materials

Using organic materials such as wood chips or pieces of fabric with landscape fabric can create issues. As the organic materials break down, they can become trapped under the fabric, creating a breeding ground for insects and disease. Additionally, weeds can still grow on top of the fabric, defeating the intended purpose.

Therefore, it is important to carefully weigh the pros and cons of using landscape fabric under mulch and consider alternative options that may better suit your needs.

wood chips

Alternatives to Landscape Fabric Under Mulch

If you’ve decided against using landscape fabric under mulch, there are several alternatives that you might consider.

Grass Clippings

Grass clippings can be an excellent mulch alternative; they are free and reduce landfill waste. However, it’s important not to use grass clippings that have been treated with herbicides or pesticides, as that could affect the health of your garden.

Garden Staples

Garden staples are used to secure fabric or plastic to the ground, keeping it in place. They are easy to use, inexpensive, and reusable for several years. However, they are not the most effective solution for weed control, and if not installed correctly, they can be a tripping hazard.

Rubber Mulch

Rubber mulch is made from recycled tires, making it eco-friendly. It is durable, long-lasting, and does not attract insects or rodents. However, it can be expensive, and since it doesn’t break down, it doesn’t contribute to soil health.

Black Plastic

Black plastic is an effective weed barrier; it blocks sunlight and deprives weeds of the energy source they need to grow. It is inexpensive and easy to install, but it’s not very aesthetically pleasing and does not contribute to soil health.

Wood Mulch

Wood mulch is an excellent alternative to landscape fabric; it is organic and contributes to soil health as it breaks down over time. It also improves moisture retention and regulates soil temperature while keeping weeds in check. However, it can attract pests and may need to be replenished over time.

A Comparison Table of Alternatives to Landscape Fabric Under Mulch

Pros Cons
Grass Clippings – Free and reduces landfill waste
– Improves soil health
– Treated clippings can be harmful
– Needs frequent replenishing
Garden Staples – Inexpensive and easy to use
– Reusable for several years
– Not effective for weed control
– Can be a tripping hazard
Rubber Mulch – Durable and long-lasting
– Eco-friendly material
– Does not attract pests
– Expensive
– Does not contribute to soil health
Black Plastic Effective weed control
– Inexpensive and easy to install
– Not aesthetically pleasing
– Does not contribute to soil health
Wood Mulch – Organic and improves soil health
– Regulates soil temperature and retains moisture
Effective weed control
– Needs replenishing over time
– Attracts pests

Alternatives to Landscape Fabric Under Mulch


After weighing the pros and cons of using landscape fabric under mulch for weed control in your garden, it is essential to consider other factors that can impact the health and growth of your plants.

It’s important to note that landscape fabric may not be a permanent solution as it may decompose over time, and in some cases, it may even hinder the growth of plants.

The type of mulch you choose, such as river rock, can also affect soil moisture and the growth of weeds, which should be considered when making your decision.

While woven fabric can provide an effective barrier against weeds, it may not be the best option for all situations. Alternatives such as rubber mulch, black plastic, or even wood mulch can be considered, depending on your specific needs and preferences.

Ultimately, the key to maintaining a healthy garden is to balance the benefits of weed control with the health of your plants. By considering factors such as soil moisture, the type of mulch, and the growth of weeds, you can make an informed decision that provides long-term benefits for your garden.


What are the pros of using landscape fabric under mulch?

Using landscape fabric under mulch has several potential benefits. It can help suppress weed growth by preventing sunlight from reaching the soil surface. It also acts as a barrier to organic matter, preventing it from decomposing and nourishing weeds. Additionally, landscape fabric creates a barrier for plant roots, protecting them from competing with weeds for nutrients and water.

What are the cons of using landscape fabric under mulch?

While landscape fabric under mulch can be beneficial, there are some drawbacks to consider. Over time, the fabric can break down and become visible in flower gardens, affecting their aesthetic appeal. It can also hinder the natural decomposition of organic materials like wood chips, which are essential for soil health. Additionally, landscape fabric may require periodic replacement or repair due to damage or wear and tear.

What are some alternatives to landscape fabric under mulch?

If you prefer not to use landscape fabric under mulch, there are alternative options available. One option is using grass clippings as a natural mulch that can help smother weeds. Another option is securing mulch with garden staples, preventing it from shifting and exposing the soil. Rubber mulch, black plastic sheets, and wood mulch are also popular alternatives that can effectively suppress weed growth.

What is the best choice for long-term weed control under mulch?

The best choice for long-term weed control under mulch depends on your specific needs and preferences. Woven landscape fabric is often regarded as a permanent solution, as it is durable and allows water and nutrients to penetrate while blocking weeds. River rock mulch can also be effective in preventing weed growth, as its large size limits the germination of new weed seeds. Consider the soil moisture requirements, aesthetic preferences, and desired level of weed control when choosing the best option for your garden or landscape beds.

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