Achillea millefolium is a PERENNIAL growing to 0.6 m (2ft) by 0.6 m (2ft in) at a fast rate. It is hardy to zone (UK) 2 and is not frost tender. It is in flower from Jun to August, and the seeds ripen from Jul to September. It is noted for attracting wildlife.
Yarrow has a high reputation and is widely employed in herbal medicine, administered both internally and externally. Some caution should be exercised in the use of this herb since large or frequent doses taken over a long period may be potentially harmful, causing allergic rashes and making the skin more sensitive to sunlight. The herb combines well with Sambucus nigra flowers (Elder) and Mentha x piperita vulgaris (Peppermint) for treating colds and influenza. It also contains the anti-inflammatory agent azulene, though the content of this varies even between plants in the same habitat. The herb is harvested in the summer when in flower and can be dried for later use.
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