This native sunflower is the grandfather species of them all and is a true staple of any wildflower garden. Bright, cheerful flowers are 3-4 across and grow to be 24-72 tall. Wild Sunflowers are extremely easy to grow, open-pollinated and attract butterflies, bees, birds and hummingbirds to the garden all season long. This native beauty is also the state flower of Kansas! Annual.