We don’t sell that product but I’d suggest following the directions on the label. This would be a good question for the people at the place where you purchased it. We sell Bonide Annual Grub Beater which should be put down and watered in with a full inch of water during the second two weeks of July. Applied properly and watered in immediately after application Grub Beater will kill over 90% of the grubs that hatch during August and early September. One application every July is all that is needed. HERE’S a link to more on grub control.