A whole bunch of bald eagles live above my patio and deck on a huge Spruce tree and have been dropping eagle guano all over some of my brugs. Would you call that foliar feeding? LOL Anyway up here on the Pacific North West Coast on Vancouver Island, we have a mulch called fish compost, made from Salmon morts from the fish farms and mixed with bark mulch. I top dress all of my gardens with it in the spring and mix it with potting soil for the brugs. They seem to love it.