Mark from Lumberton, Nc writes
Ike's Sandbur and Crabgrass Preventer is best applied by itself in early spring and late fall to prevent weeds from germinating but can also be tank mixed with post emergent herbicides when weeds are actively growing. Per the product label, the efficacy of Sandbur & Crabgrass Preventer will be best if the application is followed by one-half inch of rainfall or its equivalent in sprinkler irrigation. If Sandbur & Crabgrass Preventer is not activated by rainfall or irrigation within 30 days, weed control may be erratic.
Answer last updated on: 07/06/2021