Should You Use Landscape Fabric Under Mulch or Gravel?

If you’re planning a new flower bed or laying fresh gravel, you’ve probably asked yourself: “Do I need landscape fabric under this?” It’s a common question—and the answer isn’t as simple as “yes” or “no.”

At High Country Landscape Supply, we hear this all the time from homeowners and contractors across Alabama. Let’s break it down with real talk, so you can make the right decision for your project.

What Is Landscape Fabric, Anyway?

Landscape fabric is a woven or perforated material laid on the ground to block weeds while still allowing water and air to pass through. It’s often sold in rolls and is installed before mulch, gravel, or rock are placed on top.

There are different grades of fabric depending on the material and purpose:

• Woven fabric (stronger, better for gravel and rock)
• Spun-bond fabric (softer, often used in garden beds)
• Perforated plastic (cheaper but not long-lasting)

When Landscape Fabric Makes Sense ✅

Here are some situations where using landscape fabric is a smart move:

1. Under Gravel or River Rock

When you’re laying decorative gravel or river rock, especially in walkways or driveways, fabric helps:

• Prevent rocks from sinking into the soil
• Reduce weed growth underneath
• Make cleanup easier if you ever need to remove or replace the material

Fabric also adds a layer of separation between the soil and stone, which can help with drainage and longevity.

2. For Long-Term Low-Maintenance Beds

If you’re creating a bed that won’t be changed often—like one filled with shrubs, evergreens, or ground cover—landscape fabric can reduce the need for constant weeding. Just remember to overlap the seams and secure the edges well with pins or stones.

3. To Stabilize Sloped Areas

On hillsides or erosion-prone spots, fabric acts as an anchor layer under mulch or rock. Combined with landscape timbers or edging, it can keep your materials in place during heavy rain.

When You Might Skip It ❌

Not every job needs landscape fabric. Here’s when it might cause more trouble than it’s worth:

1. In Annual or Vegetable Beds

If you like to switch things up seasonally, fabric gets in the way. It’s a hassle to cut and remove every time you plant.

Plus, in vegetable beds, you want the soil to breathe and interact with compost more directly. Fabric can actually block healthy soil-building in these cases.

2. Under Mulch (Sometimes)

This one’s tricky. While fabric under mulch does block weeds short-term, over time:

• Weeds will grow on top of the fabric as organic matter builds up
• Water may start pooling if the fabric clogs
• Tree and plant roots can get trapped between mulch and fabric, struggling to thrive

If you’re using natural mulch and refreshing it annually, you may be better off skipping the fabric and focusing on good mulch depth (2–3 inches) instead.

A Better Alternative for Some Yards

Instead of fabric, some folks opt for:

• Thick layers of mulch alone to suppress weeds
• Cardboard or newspaper as a biodegradable weed barrier
• Compost-rich topsoil to encourage healthy groundcover growth

At the end of the day, it’s about using the right method for your space—not a one-size-fits-all fix.

What We Recommend at High Country 🌿

Here’s our quick cheat sheet:

Project Type	Use Fabric?	Material Suggestions
Gravel Paths	✅ Yes	Crusher run, pea gravel, river rock
River Rock Beds	✅ Yes	4″–12″ Tennessee River Rock
Perennial Shrub Beds	✅ Optional	Pine nuggets, hardwood mulch
Vegetable Gardens	❌ No	Compost, topsoil
Flower Beds	❌ Optional	Pine bark, dyed mulch

When in doubt, stop by or give us a call at (205) 225-7155. We’ll help you pick the best solution for your project—and we’ve got landscape fabric in stock, too, if it turns out you need it!

Whether you’re building a dry creek bed or a raised garden, we’ve got the materials and know-how to help you do it right the first time.