Seed Needs, Coreopsis Plains (Coreopsis tinctoria) 1,000 Seeds Quality Coreopsis seeds packaged by Seed Needs. Intended for the current and the following growing season. Packets are 3.25" wide by 4.50" tall and come with a full colored illustration on the front side, as well as detailed sowing instructions on the reverse. Coreopsis Plains is popularly grown in much of the United States. It is an annual flowering plant that will grow quickly, bloom profusely through the summer months, later dying with the first killing frost. The small yellow flowers are accented with mahogany colored centers and each flower head is about 1 to 1.5 inches wide when in full bloom. Coreopsis Plains will grow to a mature height of roughly 30 to 36 inches tall and can spread 1 to 2 feet wide. They are perfect to fill a bland space in the garden or in the field, as the plants will have no troubles producing a cluster of beautiful flowers. All Coreopsis seeds sold by Seed Needs are Non-GMO based seed products and are intended for the current & the following growing season. All seeds are produced from open pollinated plants, stored in a temperature controlled facility and constantly moved out due to popularity.