Terri from Norman Ok writes
I purchased some a couple of years ago. It has been kept in a dark cool place. I have used it but I store it carefully.
Martins IGR has a shelf life of about 3-5 years from the date of purchase. The product should be stored in a place where it is protected from over heating, freezing and direct sunlight to ensure the longest shelf life possible.
Answer last updated on: 04/30/2013
