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Under Fence Weed Barrier


SKU MM-HDPE-18-40-100

Our under fence weed barrier is ideal for situations where invasive weeds are persistently encroaching on your landscape. The barrier is contracted from heavy-duty HDPE plastic and is available in two thicknesses; 40 mil, 60 mil, and 80 mil. The material is both tear and puncture resistant and designed to repel even the most aggressive weeds. The material is available in 10", 18”, and 24” wide rolls which can be easily cut down to suite your specific installation. The material is shipped in 100’ rolls and is made in the USA.

To install simply dig a trench under your fence, place the barrier vertically in the ground and then attach to the bottom of the fence using screws and washers (not included). Finally, backfill around the under fence weed barrier to help conceal the plastic. The material can be painted to match your fence or simply add additional backfill to conceal the barrier.

Note: Our HDPE plastic is only available in roll widths up to 60 inches.

Please note that we are unable to provide custom roll lengths.

Product Info

  • Model: HPDE
  • Material: High Density Polyethylene (HDPE)
  • Size: Various
  • Free Shipping
  • Need a written quote? Request Online
  • Questions?  Call (800) 604-5537

Product Benefits

  • Waterproof
  • Commercial Grade
  • UV Resistant
  • Non-Biodegradable
  • Will Not Rot or Mildew
  • Resistant to Rodent and Insect Damage
  • 100 Year Material Lifespan
  • Made in the USA

Connecting HDPE Pieces

There are two ways to connect multiple pieces of HDPE together. One method is to overlap the HDPE and use our double sided seam tape to connect the two pieces. The other method is to butt the ends together and use our 17 mil single sided seam tape to create a solid connection.


Overlap Method
(for underground installations)

The overlap method is best used when connecting two pieces of HDPE in a buried application. Due to the overlap, a ridge is exposed which is not ideal when installed in exposed vertical or flat installations in high traffic areas as there is a possibility of an object catching on the ridge and pulling the two pieces apart.

In a below ground installation, the large overlap area provides a more water resistant connection as well as enhanced protection against tree and plant root intrusion.

View Tape Pricing and Seaming Instructions >

End to End Method
(for exposed installations)

When installing HDPE on a wall, floor or anywhere that is exposed, the end to end method provides a secure connection and does not leave any ridges exposed to potential catching by a person or object.

View Tape Pricing and Seaming Instructions >


  • All HDPE rolls ship for free (standard ground, see map)
  • Call: (800) 604-5537 for pricing and shipping questions.

    Shipping estimates shown on the map pertain to this specific product only. HDPE orders typically ship same day if the order is placed before 12:00 noon CST. Transit times displayed in the map are listed in business days, and are approximate. Transit times are subject to stock levels at regional warehouses.  The day that the order is shipped is not counted as a transit day.

    Shipping Map
    Bark being placed in garden

    Placing Bark Around a Plant

    Prevent Weeds From Growing To Create A Weed-Free Garden

    You may be new at gardening or have spent too much time trying to keep weeds under control with very little effect. The sooner you can eliminate weeds, the better your odds are to have a healthy, weed-free garden. Weeds are plants that take root in gardens and then multiply out of control.

    Weeds have a natural ability to spread throughout the garden. Even if you mow the yard on a regular basis, weed roots are deeply embedded into the ground and will continue to grow. While there are people who actually like weeds most people want to get rid of them. Many well-known weeds include thistles, dandelions, crabgrass, and the list goes on. In general, weeds are annoying and hard to keep under control unless you have recommended products to help you out.

    Weeds have the innate ability to keep right on growing and spreading throughout your gardens and yards. The reasons weeds continue to spread include the following:

    • Enormous seed production
    • Quickly germinate and establish themselves
    • Seeds can remain dormant longer than you think.
    • Weeds can take over areas of high traffic

    Weeds are competitive in many ways including fighting off grass and garden plants for light, space, water, and nutrients in soil. Unlike other plants, weeds can take over very quickly and are hosts for diseases and insects. Before you can even blink an eye, they will rob your plants of their needed nutrients.

    Preventing Weeds

    First and foremost, to prevent weed growth you must catch them before they take root. You have to realize the job is not a one-shot deal. You must continually deal with weeds in your garden. It takes a lot of work and time. On the upside, preventing weeds as they first appear or when they sprout, actually takes less time than trying to remove established weeds. The following tips should help you create a weed-free garden:

    Cultivation & Tilling

    You should never avoid cultivating and tilling when you create a new garden bed. This is the best way to make sure the soil is aerated by using organic material. Unfortunately, what you don't see are the seeds that are buried deep in the soil lying dormant just under the surface. If you move them to the top of the soil, they will awaken and boost germination. Once you have established the new garden bed, avoid tilling and cultivating unless it's necessary.

    Spraying Weed Killer

    Weed Killer Being Sprayed in Garden

    Use Pre-Emergent Herbicides

    If you want to prevent weeds from growing from the very beginning, you need a pre-emergent herbicide to stop weeds and weed seeds from germinating. These herbicides are excellent choices for preventing the growth of weeds. They are created to target certain combinations of weeds and weed families.

    Apply the pre-emergent to your garden before weed seeds can germinate in the early spring or after cultivating. After treating the area with a pre-emergent, give the area a good soaking as water will activate the pre-emergent. The water draws the herbicides down into the seed level for great results.

    Apply Mulch To Your Beds

    One natural and effective way to prevent weeds from moving into your garden is the use of mulch. Apply a thick layer of organic mulch around 2 inches deep in the garden area. You must avoid the base of your plants and shrubs. Mulch has the ability to help your soil retain moisture and will smother any small weeds by creating an unfriendly environment for any tilled-up weed seeds. Even though non-organic mulches, including landscaping fabric and plastic, last longer than organic mulch like cedar, leaves, and pine needles, they do not break down in order to create a healthy soil environment.

    Place Plants Close Together

    Weeds absolutely love open, sunny spaces between your plants. Plants such as vegetables, flowers, and shrubs should have the closest recommended spacing. To eliminate open spaces where weeds will pop up, consider using block spacing instead of growing in rows.

    Prevent Hitchhikers

    Young plants you purchase from your local nursery will carry weeds along with them. Even in a nursery environment, weeds will spread. You should thoroughly inspect all new transplants very closely to make sure they are not bringing any unwanted weeds along for the ride. If you see seeds or sprouts, make sure to pull out any undesirables before transplanting them into your garden.

    Pulling Weeds by Hand

    Gardener Pulling Weeds

    Weed Pulling Is Mandatory

    Even though it seems like an endless task, pulling weeds from your garden will pay off in the long run. Every weed that is removed before it goes to seed will eliminate hundreds of offspring. Have a weeding schedule in place and stick to it. The best time for weeding is when the soil is moist and plants are still young. Carefully pull weeds at the base, while disturbing as little soil as you can, and throw them away. If you run into some difficult roots take a sharp knife or a weeder and place it in the ground to cut the weed from its roots without disturbing the soil or mulch around it.

    Create Your Own Drought

    Keep in mind, when you water the entire garden, open spaces or areas will become a breeding ground for weeds. Do not give weeds any water by using a soaker hose to add moisture only where it's needed at the base of the plants. It will help cut back on weeds.

    Plant Cover Crops

    There are many vegetable gardens that are dormant during the winter months. Some annual weeds will actually grow during the cooler weather like chickweed and deadnettle. You might wonder how you can prevent weeds from growing in gardens without any plants or mulch? You can keep these weeds from germinating and taking over the yard by planting a little competition!

    Some cool season cover crops include ryegrass and clover which will create a barrier for weeds by competing for light, water, and nutrients. During early spring till them under to add organic material and nutrients into the soil.

    In Conclusion

    Following some of these valuable tips could help you create a perfect environment for your garden and lawn without creating an ideal location for weeds to grow. Knowing how to prevent weeds in gardens is actually quite simple. If you take the time to prevent weeds from taking over, you can save yourself a lot of time and energy normally used to pull weeds.