i would not ever use urine on any of my plants,get some blood meal for nitrogen,bone meal for potas,better yet just plant them babies in some fox farm ocean forest ,start them in solo cups dont forget to poke holes in bottom ,when roots hit the bottom of cup pot them up ,take one of the cups and fill it to judge your weight ,so you will no when to water after a while you will have it down to a art on how to judge the weight .lot of pepole say to just pot them in what your gonna grow them in ,i dont because i like to keep the soil fresh and by the time i get to my 5 gal pots ,have that fresh rich soil in there to finish them ,thats just my opinion .but use piss in something your going to smoke,hope this helps you a little man