Oenothera serrulata, commonly known as Yellow Sundrops, is a perennial subshrub native to dry, open plains and prairies across central North America, including regions of central Canada and the central United States. It is particularly adapted to thrive on various substrates, such as limestone and gypsum. Yellow Sundrops typically grow up to 18 inches tall and feature narrow, toothed leaves. The plant is known for its bright yellow flowers that bloom from March to November, opening in the morning and closing by the afternoon, with the blooms eventually fading to orange or pink. The flowers are quite showy and attract pollinators such as bees and butterflies.

Yellow Sundrops are valued for their extended blooming period and drought tolerance, making them suitable for xeriscaping and rock gardens. They are also used in border plantings and wildflower meadows. This plant prefers full sun and can tolerate a range of soil types, provided they are well-drained. While generally low-maintenance, it is important to avoid overwatering to prevent root rot. Yellow Sundrops can self-seed prolifically, which should be considered when planting in smaller gardens to prevent unwanted spread.CC BY-SA 4.0