What the heck are they, and why are they important? Have you ever wondered why you’re told to apply crabgrass pre-emergent herbicide around the same time that the forsythias are in bloom?  Is it an old wives’ tale, passed on through the generations that we just take for fact?  Well, no.  There is some tried and true science behind it, along with the reason horticulturists use specific timing to scout, […]