Over 30 Naturally Occurring Trace Minerals to Support Healthy Plant Growth and Boost Microbial Life in the Soil Assists in the conversion of organic matter to humus and release of existng nutrients to plant roots Made with OMRI listed ingredients Mined in Colorado Many soils lack the secondary and trace minerals that plants and trees need for healthy growth, fruit and crop production. Trace elements or micro-nutreints are just as vital to the plants as macro-nutrients. A deficiency of trace minerals can cripple plant growth, lessen nutritional value and potentially limit a soil's productive capacity. Planters II Trace Mineral is a nutrient dense trace mineral that supports the growth of healthy plants and trees. It is a complex of naturally occurring minerals and contains essential elements needed for plant growth.