If in the US get Grandmas Unsulphured Molasses its in the green label jar. The yellow label has sulphur which you dont want. Depending how you grow ie hydro or soil dictates your feeding schedule. In Hydro its best to mix the molasses in a gallon of warm water so it disolves well first. Its a mixture of 2 Table spoons per gallon of water. In hydro add with nutes each week in floor every 3rd week flush the system for 2 straight days plain ph 5.5 water or with a clearing solution. For soil same amount 2 Table spoons per gallon of water every other watering time no more then twice a week as it can invite bugs from its sugars.I always start 2nd week of flower....Almost forgot do not run it in aeroponics it will foul all your sprayers and it foams up like rootbeer