This flower spreads throughout much of North America.Plains Coreopsis is yellow with a maroon center.It prefers full sun in various soil types.Plains Coreopsis grows to about 1-3 feet.The germination is 15-30 days.Soil temperature is 60F-65F.The blooming time is May-August.Average seeds per pound is 1,400,000.The seeds carry about 925.Seedingrate is 2 Ibs.It covers 1,361 sq. feet.It grows in ditches,low lying areas,mixes.Often forms long colonies in ditches along roadsides.The name is Coreopsis tinctoria.The classification nameis Asteraceae.A fact,is that Plains Coreopsis looks like a Indian Blanket. I got my imformation from http://aggie-horticulture.tamu.edu/wildseed/drummondphlox.html