Horsetail Herb (Equisetum arvense) – sold as dried herb, used as a tea on plants and soil. Our Equisetum is wildcrafted from high elevations of the Rocky Mountains of Colorado. Excellent addition to compost teas. Used as a preventative treatment for fungal issues and to balance the functions of all the Biodynamic preparations. Its primary element is organic silica. Planetary relations – Saturn, outer planets, comets and shooting stars.