Fill your jar half way with dried yarrow or 2/3 of the way with chopped fresh yarrow.
Pour the alcohol or apple cider vinegar over the herbs. Completely fill the jar and seal with a lid. Shake well.
Label and date your jar.
Store your jar out of direct sunlight for 4-6 weeks. Shake your jar often, every day if possible.
After 4-6 weeks, strain off the herbs and discard. Fill a small tincture bottle (with a dropper) for daily use and pour the remainder in a clean dark colored jar.
Label and date your bottle and jar. Store in a cool, dark place where it will keep for several years.
Notes
Apple cider vinegar will cause your metal caps to rust. If using apple cider vinegar in your tincture, use either a plastic lid or place a piece of plastic wrap between the jar and the metal lid.