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Message: [QUOTE="NC_Uconn_Fan, post: 2774403, member: 3502"] For crabgrass, you want to apply when the soil temps reach 50 degrees. A good indicator of that is you will see the Forsythias start to bloom. The best and most commonly used/recommended are Dithiopyr (Dimension), Prodiamine (Barricade). You are recommended to do a second application 60 to 90 days after the first for extended control. If you miss this target window, it's too late to stop ceabgrass from germinating. Annual weeds, like crabgrass, are best controlled by breaking their natural cycle of germination, growth and seeding. You do this 2 ways, first is to prevent them from germinating in the first place (preemergent). The second is by killing them after they germinate, but before they seed (herbicides). [/QUOTE]