Epilobium parviflorum, commonly known as Hoary Willowherb, is an herbaceous perennial that is native to a variety of moist habitats including marshes, swamps, and moist mountain meadows across Europe, North Africa, and Western Asia. It thrives at elevations up to 8202 feet. This species typically grows to a height of 12-31 inches with hairy stems and lanceolate leaves. The plant produces small pink to purple flowers in the summer, which are modest in appearance but can add a splash of color to naturalistic plantings.

Hoary Willowherb is valued for its ability to thrive in wet conditions and is often used in rain gardens, bog gardens, and other water-influenced landscapes. It is also appreciated for its ease of maintenance and its use in traditional medicine. In cultivation, it prefers full sun to partial shade and requires consistently moist soil. While it is not known for serious pest or disease problems, it can spread aggressively by seed and rhizomes, potentially becoming invasive outside its native range. Gardeners should be cautious and check local regulations before planting.CC BY-SA 4.0