Ambush Heads LLC says it was inspired to develop the WeedSharks trimmer system by nuisance weeds such as thistles, grease weeds, mustard weeds and others. WeedSharks attach to an operator’s gas-powered string trimmer. The patent-pending “hovering system” guarantees control, according to the company. Also, patent-pending “fins” hold effective line and dissipate cut-weed buildup from the trimmer’s driveshaft. And the tail-whip design creates a dual-action cutting motion to chomp up anything in its path, the company assures.