HydroOrganics 100209946 Plant Food, 1 Quart, White Elements micro is a micronutrient formula developed for plants to help prevent and treat micronutrient deficiencies For use with planting mixes, coco-coir and native soils and is formulated to be used on indoor or outdoor plants May be applied via hand Feeding and hydroponic systems Can be used as a micronutrient booster or as part of elements total solution.