Scarlet Toothcup

About Scarlet Toothcup

Scarlet Toothcup is a charming and often overlooked native annual that thrives in the transient wet spots of the landscape. This emergent wetland plant features unique, square stems and narrow leaves that clasp the stem in pairs. From mid-summer through early fall, it produces small but vibrant purple to scarlet flowers tucked into the leaf axils. Native to much of North America, it is typically found on muddy shorelines, in ditches, and in areas with periodic flooding. As an annual, it relies on its abundant seed production to return each year, with seeds often germinating as water levels recede in late spring. It is a valuable plant for supporting specialized wetland pollinators and provides cover for small aquatic organisms. Scarlet Toothcup prefers full sun to partial shade and saturated, muddy soils. It is an excellent choice for rain gardens, pond margins, or any low-lying area where water tends to collect and slowly drain.