Identifying Evening Primrose: The Yellow "Moonflower" with Serrated Leaves

The spreading plant with serrated leaves and pale yellow flowers called "moonflower" is likely evening primrose (Oenothera spp.).

Identification

• Flowers open late afternoon/evening.
• Four petals, yellow, often fragrant.
• Rosette of serrated basal leaves.
• Spreads by seed and rhizomes.
• Hardy to zone 5.

Common Confusion

"Moonflower" name applies to many night-bloomers (Ipomoea alba, Datura, Oenothera). Your description matches evening primrose.

Management

• Deadhead to limit spread.
• Divide clumps in spring.
• Enjoy the evening show.