Polygonum polygaloides subsp. confertiflorum, commonly known as Denseflower Knotweed, is a perennial herb native to Western North America, particularly found in meadows, wetlands, and along streambanks at mid to high elevations. It typically grows to a height and width of 0.5-1 feet (0.15-0.3 meters), forming dense mats. The plant features small, white to pinkish flowers that are inconspicuous, blooming in the summer. The flowers are arranged in dense clusters, giving the plant its common name. Despite their size, the flowers are important for local pollinators.

Denseflower Knotweed is valued for its ability to stabilize soil and for its resilience in rock gardens or restoration projects. It is also used in native plant gardens and as a ground cover due to its mat-forming habit. This species is adapted to a range of conditions but prefers full sun exposure and well-drained sandy or loamy soils. It requires moderate watering, especially in drier conditions. While it is not known for significant pest or disease issues, it can be susceptible to root rot if overwatered or planted in poorly drained soils. Denseflower Knotweed is not typically associated with aggressive roots or invasiveness.CC BY-SA 4.0