What is USDA?
It’s official recognition of Organic Product from US’s Department of Agriculture
USDA certified organic foods are grown and processed according to federal guidelines addressing, among many factors, soil quality, animal raising practices, pest and weed control, and use of additives. Organic producers rely on natural substances and physical, mechanical, or biologically based farming methods to the fullest extent possible.
– See more at: http://blogs.usda.gov/2012/03/22/organic-101-what-the-usda-organic-label-means/#sthash.3usDfgMz.dpuf