, if you are using agood mj growing soil ( like one from plagron or biobizz) you dont have to fee for the next 3-4 weeks
. Normally you start just around flower starts . And the plant shows you whn shes hungry. leaves are fading, oder leaves turn yello, then its the time to start feeding. Before the soil does it. One more hint give the little ones their final pot....asap... because if they stay in small pots they tend to stay dwarfy