Root Build 240 - 10 lbs.ARBICO Organics Root Build 240 is a micronized mycorrhizal blend suitable for most crops! Soil preparation is imperative when readying plants and the growing environment for the upcoming season! ARBICO Organics Root Build 240 provides a mixture of mycorrhizae that aids most plants establish themselves. Mycorrhizal fungi form symbiotic relationships with plant roots to stimulate the development of healthy, strong root systems throughout the growing