Wash your fresh yarrow leaves, flowers, and stems and allow them to airdry overnight or pat them dry with a cloth.
Use a knife, food processor, or mortar and pestle to chop up fresh yarrow. We do this to maximise the surface area of the plant that is exposed to the alcohol.
Add the plant material to a clean glass mason jar. If you’re using fresh plant material, fill the jar ¾ of the way full. If you’re using dried yarrow, fill the jar ⅓ of the way full.
Cover the yarrow with 80-proof or above alcohol - I tend to use unflavoured vodka.
Add a piece of parchment paper between the jar and the lid, and then put a lid on the jar. Shake the jar to make sure everything is covered in alcohol. Set the jar in a cool (room temperature is fine), dry place away from direct sunlight.
If you used dried yarrow, top up your jar the following day to make sure everything remains below the alcohol.
Add a label and date so you don’t forget what it is and when you made it.
Let the jar sit for 6-8 weeks and try to shake it a few times a week to keep the yarrow submerged in alcohol.
After 8 weeks, use cheesecloth or a strainer to strain off the tincture.
Add the liquid extract to an amber glass dropper bottle. Don’t forget to date and label it so you don’t forget what it is.