Recipe #55 Horsetail spray Categories: Garden, Diseases, How to make Another plant that many consider a weed can be used for a different purpose and is available through suppliers who specialize in biodynamic garden supplies is Horsetail (Equisetum arvense) and they make Horsetail Spray... Its used to prevent fungal diseases. In a glass or stainless steel pot, mix 1/8C of dried leaves in 1 gallon of unchlorinated water (if you have chlorinated water its best to use rainwater, or let tap water sit for a couple days to allow chlorine to volatilize).. Bring to a boil, let simmer 1/2 hr. Cool and strain through cheesecloth. Store any extra in a glass container and the mixture is good for 1 month. You dilute the 1 part horsetail concentrate to 5-10 parts unchlorinated water. Spray infected plants once every week or two. If you suspect an outbreak or prevailing weather conditions are imminent begin a preventative spraying program even before you spot any symptoms... This recipe is from Rodale's. -----