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Oenothera lamarckiana (Onagraceae)
A robust annual, of unknown origin which has naturalized throughout the United States. Flowers are light yellow borne on tall, sturdy spikes. Blooms are up to 2 inches across, opening in late afternoon. Prefers well-drained soils in full sun. Evening Primrose can tolerate high pH levels and is less aggressive than other species within this plant family.
Average planting success with this species: 70%