My mother in law always did this, I though it was the chemicals in the peel that made it work so well. Just flatten a banana peel and bury it under one inch of soil at the base of a rosebush. The peels potassium feeds the plant and helps it resist disease...works for tomato plants too.
Start Perennials the Easy Way - How would you like to save money on plants? Start perennials from seed with this easy method: Plant your seeds in a milk jug, set it outside and let Mother Nature do the rest.