Blue Yarrow pure essential oil has many notes to it's aroma: rather sharp, woodsy, fruity, herbaceous and mildly sweet. Blue Yarrow mixes very well with most any other essential oil. This essential oil is quite powerful and should be used in small amounts. Botanical name: Achillea millefolium Method of extraction: Steam distillation Details: Choose 1 or 2 oz size. Your essential oils will come in an amber glass bottle, along with a dropper insert you can apply after receiving. We ship with a cone lined cap to prevent leakage while in transit. Tester size is 1/2 oz amber glass bottle with screw on cone lined cap.