I'm using a liquid fertilizer thats using N,P,K. It isn't a homemade fertilizer, but it could be i suppose. Just a straight ratio...21.21.21. Works wonders..... Also, when i clean out my fish pond i spray my orchids with the old water..... It's full of nitrogen because of the fish dirt in it. Now that does work wonders....Especially on young plants (acts like a turbo)