This is a one of the common Cannabis growers FAQs, but its hard to answer directly. The strength of your nutrient mix is very much dependant on the age, strain, and stage of the growth cycle of your cannabis plants. Experience will give you personal guidelines that suit your growing best. General guidelines:Young vegetative plants: Start off 0.2 points above your Background ECEstablished vegetative plants: Should be around 0.8 EC, after gradually raising EC by 0.2 points, as the plants have grown.Established flowering plants: Can be anything from 1.0 to 1.8 EC. Raise EC slowly, your plant will tell you when it's too much. If it's too strong, your plants will display signs of nutrient excess. In which case, lower the EC.