Yarrow thrives in the poorest and driest soils, as well as those that are heavy and wet. Yarrow is of great value in the Clifton Park System on account of the mass of rootage it produces, and this applies generally. It will stand fierce drought better than any other field plant. It grows up to 18 inches in height. The flowers look very like others in the daisy family except they are very small. It flowers between June and August. Its medicinal properties have been recognised since time began.