Helianthella uniflora, commonly known as the oneflower helianthella, is a perennial herb native to a variety of habitats including open woodlands, meadows, and grassy slopes in the western United States and Canada, ranging from British Columbia to northern Arizona and New Mexico. It typically grows up to 47 inches tall and has lanceolate leaves that can reach up to 10 inches in length. The plant is characterized by its solitary, large, daisy-like yellow flower heads that bloom from late spring to early summer, each head perched atop a single, erect stem. The flowers are quite showy and attract a variety of pollinators.

Oneflower helianthella is appreciated for its bright yellow blooms that add a splash of color to wildflower gardens, meadows, and naturalized areas. It is relatively low maintenance, requiring minimal care once established. In cultivation, it prefers full sun to part shade and thrives in well-drained soils. It is drought-tolerant once established, making it suitable for xeriscaping. While it is not commonly afflicted by serious pests or diseases, it can occasionally suffer from rust or mildew in overly moist conditions. This plant is not known for aggressive roots or invasiveness, making it a good choice for gardeners looking for a reliable and attractive perennial.CC BY-SA 4.0