Equisetum 508 is made from a decoction of the herb Equisetum Arvense. It has the effect of encouraging the growth of beneficial fungi in the soil in the fermented form and minimising the occurrence of detrimental fungal diseases on plants when sprayed on them as a fresh concoction. You can make up your own fresh or fermented Equisetum, 100g makes 10L of concentrated tea. Instructions are included. Please note: Equisetum sp. plants and seeds are declared noxious weeds in Australia. The dried Equisetum we sell is imported with AQIS approval. A 5ml via does up to to 25ha.