According to the Germplasm Resources Information Network of the United States Department of Agriculture, Ruellia humilis is native to the following states:[1] Alabama, Arkansas, Georgia, Illinois, Indiana, Iowa, (eastern) Kansas, Kentucky, Louisiana, Maryland, Michigan, (southeastern) Minnesota, Mississippi, Missouri, Nebraska, (western) North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, (eastern) Texas, West Virginia, Wisconsin, and Virginia.

The lavender flowers bloom in July into September and open in the morning and fall off in the evening.

[4] Ruellia humilis grows in dry to average soil in full sun to part shade conditions.

Its habitats include prairies, glades, meadows, and open woodland environments.

[7] With the general exclusive presence of Ruellia humilis in the United States set, there is more data that indicates, more specifically, the type of biome and regions that this plant shows up in more often.