If using chamomile or calendula flowers, powder them in the blender or coffee grinder (see note below for tips).
Mix the finely ground flowers, or essential oil if using, with the arrowroot powder and store in a glass jar, spice jar, or sugar shaker for easy use.
Notes
You can add a few Tablespoons of the arrowroot powder to the coffee grinder with the flowers and essential oils. Blending them together this way better incorporates the ingredients and avoids clumping. Just wait for the powder to settle before you open the lid!