Pre-emergent control over tough weeds like crabgrass and sandburs is one of the most important early Spring tasks to tackle.  Stone Brothers can help you get on top of the situation before it becomes a problem.  Now is the time to apply pre-emergent solution such as Prodiamine or Dithiopyr.  For an effective, three to four month barricade against crabgrass and other tough broadleaf weeds, choose Prodiamine.  If sandburs, or stickers are lurking, take a look at Dithiopyr for pre- and early post-emergent control.