Sagittaria rigida, commonly known as Sessilefruit Arrowhead or Canadian Arrowhead, is an aquatic perennial herb native to shallow waters of marshes, ponds, and slow-moving streams in Canada and the United States, and it has also become naturalized in Great Britain. This species is characterized by its sessile female flowers, from which it derives its common name, featuring three white petals that are typical of the Sagittaria genus. The plant produces edible "potato-like" tubers, which must be harvested with caution to avoid contamination from polluted waters. Sessilefruit Arrowhead typically grows to a height of 1-3 feet (0.3-0.9 meters) and spreads through its tubers and seeds.

Sessilefruit Arrowhead is valued for its ornamental flowers and its ability to thrive in aquatic environments, making it suitable for water gardens and naturalized pond settings. It is also of interest for its edible tubers, which are a traditional food source for some Indigenous peoples. The plant prefers part shade to full sun and requires aquatic conditions, meaning it must be grown in water or in very wet soils with poor to no drainage. While it is not known for serious disease issues, care should be taken to ensure the water source is clean to prevent the accumulation of pollutants in the tubers.CC BY-SA 4.0