Depends on your growing method soil,hydro,aero?? Soil add 2 table spoons molasses every other feeding.I dont reccomend h202 in soil. In hydro 2 table spood molasses per gallon once a week during flower.H202 once a week to the res use the grotek super h202 and not the store bought pharmacy kind as it has harmful additives.In aero never use molasses and add h202 once a week at res change use 2-5 drops per gallon oif the 30% h202