Clementine, I had to giggle when you mentioned peeing on the lawn, Don't get caught. I think you might be thinking about the movie "The Worlds Fastest Indian". He was peeing on a lemon tree, I don't know if you want sour peaches.
The go-to people about fertilizers and such on here are Sean Freeman or Azrael. Maybe you should PM them. Just a thought.
Good luck!