The autos grow so fast I wouldnt bother with grow nutes you should be ready to just go right into the bloom nutes and finish it up. YOu have already past the growth stage for an auto and it should be flowering by nowhi bud i am growing auto ak47 low ryder , 26 days old i have started feeding alreday , i am using bio grow , bio bloom and big bud , cant go wrong just half the dose at the start and work up from there , bio grow can be bought on ebay around $10