I have a lifted cat grass bed that I grow on my porch. The neighborhood cats are frequently in it, which I encourage and don't mind but it was not my intention in growing it. I feed it to my cockatiel and parakeet, as it is safe for them to eat the grass AND its seeds. Part of it is growing at a weaker manner and, to put it simply, it looks funky.
It was suggested to me to fertilize it. I have been using my own organic compost for everything in garden, and I always rinse what I cut off for my birds before giving it - just to be safe.
I am curious if using fertilizer in it will make any part of it "poisonous" or unsafe for my birds or for the neighborhood cats that chew on it? Is rinsing it enough if I do use it?