Yarrow flower close up. Yarrow is cultivated as an ornamental plant by many plant nurseries. It is planted in gardens and natural landscaping settings of diverse climates and styles. They include native plant, drought-tolerant, and wildlife gardens. The plant is a frequent component of butterfly gardens. The plant prefers well-drained soil in full sun, but can be grown in less ideal conditions. The herb is purported to be a diaphoretic, astringent, tonic, stimulant and mild aromatic. The plant also has a long history as a powerful ‘healing herb’ used topically for wounds, cuts and abrasions.