You really should feed your plant based off of its needs, all strains are different. Start off by feeding what fox farm recommends for your age of pant. Then by how your plant reacts adjust how much nutes you give it, if the leafs are light green then you can slowly up the amount of food, if the leafs start to yellow at the tips then you have over fed it and you need to back off for a bit (skip one or two feedings and just give it strait water). Start out by feeding it once a week, then move on from there. Its really all up to the plant.