Yarrow is an easy-to-grow garden plant. White flowers and fern-like leaves can be used in fresh or dried floral arrangements and has a pleasing fragrance. Blooming is staggered from June to August. Yarrow is known to spread, so plant it in a place you don't mind it acting as a ground cover, next to the lawn or edge of a garden is ideal. Original native yarrow has white flowers, cultivars are colorful yellow or pink.