Great White Granular 1 Organic Mycorrhizal Inoculant 4 oz + Grow Pro Measure Conversion Chart Magnet Includes free 2" x 3-1/2" Measuring Conversion Chart Magnet! The single strain keeps the cost down but yields high! OMRI and OIM certified - great addition to any organic planting mix. Superior results in many field trials. Use on vegetables, fruits, flowers, shrubs and trees.