‘Hello Yellow’ produces loads of bright yellow flower clusters from early summer into early autumn. Deadheading early in the season will encourage the plant to send up another round of blossoms. The flowers attract hummingbirds and butterflies. It is also a host plant for Grey Hairstreak, Monarch and Queen butterflies. The dried seedpods are often used in dried flower arrangements. This is an essential plant if you want to attract a variety of butterflies to your property, especially Monarchs.