When the flowers bloom, the colors vary between purple and pink.

The tall foxglove is native to some parts of the United States and Canada.

According to USDA Plants, the places where the tall foxglove can be found are, "Arkansas, Iowa, Illinois, Kansas, Minnesota, Missouri, North Dakota, Nebraska, Oklahoma, South Dakota, Texas, Wisconsin, and Manitoba".

[4] Dr. Virginia Freire and Dr. Emmet J. Judziewicz (biology professors at the University of Wisconsin) mentioned that agalinis is Latin for "remarkable flax" and aspera is also Latin for " 'rough' or 'harsh' from coarse nature of leave".

According to COSEWIC, "human impact poses the greatest threat to these populations because most of them are in road allowance areas.