Question:I've heard that yarrow makes a good dye plant. How do we use it to dye wool yarn?
Answer: Gather leaves and/or flowers and stems anytime from spring to fall. A dozen plants will sufficiently dye about 4 to 10 ounces of yard. Put plants in a large enamel or stainless cooking pot. Cover with water and simmer for one hour. Strain off the golden dyebath. Make sure your cooking area is well ventilated because the odor can be strong.
Add the wool and simmer for one hour, then rinse. You can experiment with altering the color by adding different amounts of vinegar to the original dye bath.