Coarsely grind your dried Yarrow in a high-speed blender or food processor and place it in a large … Do not wash any of the yarrow with the exception of the roots and only with water and if necessary. … Keep a lid on the jar and let it sit on a plate in the sun for six weeks, no more. The anti-inflammatory properties of yarrow are thought to be helpful for dull, … Yarrow For Headaches. Tear or cut the herb into one inch pieces and pack tightly into a jar, to the top. Completely fill the jar and seal with a lid. Pour the alcohol or apple cider vinegar over the herbs. Helps with fever, wounds, and vascular system. Fill the jar to the top with oil (cold pressed, organic olive, coconut or other oil). By preparing this recipe you will get a yarrow tincture that is natural first aid. In a couple days, fill again to the top if some oil has soaked in.