Burr Marigold (Bidens mitis) are a small 2-3 inch annual found throughout Florida. The bright yellow flowers bloom in the fall. This plant is a herbaceous wetland flower that thrives best in full sun but can tolerate partial sun. Burr Marigolds are not only found in freshwater systems but also brackish waters along the coast. These plants need a lot of water and very little foot traffic when put in a home landscape.