Description
Common Sunflower
Helianthus annuus
Also known as Annual Sunflower or Wild Sunflower. This wild ancestor of domesticated sunflowers is native throughout the southwestern US. Multi-branched plants bear 2 inch wide flowers on stalks growing 3-6 feet tall. Birds love the seeds. Under some conditions this plant will reseed and can spread into colonies, so it is considered invasive in some states.