Looking for a way to prevent weeds for a beautiful lawn all season long. A single application of Scotts WebEx prevent with Halts in the early spring can prevent crabgrass and problem weeds. Rain, snow or freezing weather won't affect the product performance, so you don't have to worry about the elements after you've applied. Apply easily with a Scotts broadcast, drop, hand-held or Wizz spreader to all lawn and grass types.