Weed barrier mats stop ants by removing the loose, dry soil and shelter they use to build nests under walkways.

Lay heavy duty woven weed barrier mat directly over the existing pathway and secure it with landscape staples spaced about every one foot so the fabric cannot be lifted by wind or digging. If the existing path is sandy or loose, add a compacted base of crushed stone or decomposed granite before the fabric so there is a stable, less friable substrate that ants will not excavate easily. Cover the fabric with a noncomposting top layer such as coarse gravel, pavers, or stepping stones to deny ants both access and the dry voids they prefer, and avoid fine mulches directly over the mat because they can accumulate and recreate a nesting medium. Where planting rows meet the path, run the fabric at least six inches under adjacent beds to create a continuous barrier and tuck edges under borders to prevent ants from tunneling around the seams. Supplement the physical barrier by keeping organic debris and leaf litter cleared from the path surface and immediately adjacent edges since these provide moisture and food that attract ant colonies. Periodically inspect seams and any areas behind stones for tunneling, and if you find small breaches lift the fabric locally, remove the pocketed material, recompact the base, and reseat the fabric so the barrier remains unbroken.

Common mistakes start with using lightweight or nonwoven landscape cloth that tears when ants tunnel beneath it; use a heavy duty woven mat rated for foot traffic and anchor it thoroughly. Another issue is covering the fabric with fine wood mulch that will break down and become usable nesting material over time; choose inorganic covers like gravel or hardscape or replace fine mulch frequently and keep it off the fabric. A third problem is failing to address adjacent loose soil and bed edges so ants simply bypass the path barrier; extend the mat slightly under beds and maintain a clean, compact edge so there is no easy route around the barrier.

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