The Gay Feather’s scientific classification is Asteraceae. Its scientific name is Pycnostachya. This flower grows close to Tornado Ally. Some information about the Pycnostachya is:the average planting success is 50%. It grows to a total of 2-4 ft.tall. The germination is 20-40 days. One oz. covers 272 sq. ft. Two facts about this flower are:Its normal germination is 20-40 days. A suggested use is:as an accent along fence lines.