Just flatten a banana peel and bury it under one inch of soil at the base of a rosebush.
The peel’s potassium feeds the plant and helps it resist disease.
Works for tomato plants too.
Who knew!?!?!?!
Source: http://www.realsimple.com/new-uses-for-old-things/new-uses-gardening/banana-peel-10000001193282/index.html