String weed trimmers spin plastic line at over 7,000 RPM. When lawn care crews trim grass directly against wooden fence posts, the string acts like a high-speed saw blade, stripping protective stain and carving deep gouges into the timber base. This opens raw wood grain to groundwater and fungal rot.
Solution: Metal Post Shields or 6-Inch Gravel Borders
Installing $4 metal post guard collars around the base of each post deflects nylon trimmer string permanently. Alternatively, installing a narrow 6-inch crushed gravel bed along the fence perimeter eliminates grass growth completely, removing the need to weed whack.
