Tall purple blooms in late summer that attract butterflies. The roots are diuretic and helpful in urinary infections and removing urinary gravel. Gravel root, also commonly known as Sweet Joe pye weed, is native to North America and was used traditionally for its ability to promote sweating and break a fever. This plant works especially on the genito-urinary tract and helps treat incontinence in children, cystitis, and inflammation of the urethra. It helps treat rheumatism and gout by increasing the removal of waste from the kidneys.