Athosanswered grow question 4 years ago When you should start feeding depends on what kind of soil you are using and how much. A big enough pot can last a lot of time before needing additional nutrients. Let the plant feed itself from the soil and only start feeding once you see the first signs of deficiency. Your plants look healthy as they are, they do not need feeding. Foe example when using a 3 gallon (11 liter) pots with allmix, the soil would last until week 7 or 8 before needing any feeding.