Hey Nana, Growin behind the barn eh ! That's how it all started for me way back when...he,he,he  Sure feed it if needed, and usually goin into August they'll need fed. Several other things you can do also . 1. prune JUST THE GROWING POINTS of each branch, IF they haven't started to show pistils, Your plants look like they're Sativa dominant, so you can probably get in one last pruning. 2. clean up the bottoms of each plant, by that i mean the surrounding plants and weeds need either pulled, transplanted, or push down and away from the girls. Yes that includes flowers...he,he,he 3. watch for bugs, they're not done doin their thing yet. Overall, you've done good so far, no yellowing and they look healthy !!!!  Happy growin/harvest