Dried and cut flowers are used in arrangements. Colors include white, yellow, gold, pink and red. The aromatic foliage is green or gray. Cultivation Yarrow is an undemanding plant that thrives even in poor soil but does best in a sunny position with good drainage and light soil. Yarrow grows well in zones 3-8 with some cultivars extending to zone 10.
Plants are susceptible to disease in humid areas.
Propagate from seeds, by root division or from woody cuttings taken in autumn or spring. They can take a year or two to establish themselves from seed. Place the plants 1-2 feet apart and divide the clumps when they become crowded. Taller cultivars may need to be staked, especially if grown in very fertile soil. Disease Mildew Mildew is a fungal disease which causes grayish downy spots on leaves.