5. Seals Wounds
By far and away the most widely understood application of yarrow as an astringent is in the sealing of wounds. A wide variety of cuts, abrasions, ulcers, and wounds are all aided in the sealing process by yarrow, as it encourages the body’s existing functions to work more quickly and more effectively.
The use of yarrow to seal wounds has been commonplace for as long as records go back, with recordings of its use present in nearly all records of significant wars and battles, both in places where it grows naturally and in places where it must have been carried in. When looking for ideas as to how to use yarrow as an astringent, this application will be the first that pops into the majority of peoples’ heads, simply because it is almost by definition what an astringent should do.
If there is a better use for yarrow as an astringent than when healing wounds, it isn’t listed here.