Hummingbirds often seek nectar from the flowers.
For decades, zinnias have been the flowering annual of choice for spreading glorious colors throughout the garden as well as for cutting to bring indoors. It wasn't always so. Family Tree . There are more than a dozen species of zinnias, members of the Compositae, or daisy family, but only three species are regularly grown in home gardens as annuals here in Hampton Roads. Flowers are available in just about every color except blue.