when can i start fertilizing?

i have 10 babies all about a month old and looking very healthy. i was wondering if i could start fertalizing using an organic fertalizer like fox farm grow big?

start feeding when growth seems to slow or you start seeing yellowing (nitrogen def) of the leaves... you should be able to start now with no problem... start feeding with a 1/4 strength solution so your plants can get used to the nutes... increase each feeding until you reach the dosage that best works with your plants...