Oenothera lindheimeri
Light: Full sun to light shade; afternoon shade is beneficial in Phoenix’s intense summer heat.
Water: Low to moderate water once established; water deeply, then allow soil to dry between waterings. Provide supplemental irrigation during prolonged Phoenix summer heat.
Soil: Well-drained sandy or loamy soil; tolerates lean and alkaline soils. Avoid heavy, poorly drained soil and excessive fertilizer.
Mature size: Typically 2–4 feet tall in bloom and 2–3 feet wide; compact cultivars remain smaller.
Bloom: Primarily spring through fall; flowering may slow during extreme summer heat and resume as temperatures moderate.
Evergreen / deciduous: Semi-evergreen in mild Phoenix winters; may die back after frost.
Growth rate: Moderate to fast.