Control unwanted weeds from your yard or business landscape with pre and post-emergent herbicides to prevent new weeds and control already existing weeds. Welcome to Snyder's Weed Control, where we help to keep your grounds and yard weed-free! Our specialty is weed prevention in desert landscapes-which means that we can control all existing weeds and prevent future problems for any landscape in the Phoenix metropolitan area. My experience with Snyder Weed Control has been nothing but great in these last seven or eight years I've been using them.