Sun cup is a genus of annual and perennial plants in the evening primrose family Onagraceae. A total of 12 species are known, nearly all from western North America, especially in the California Floristic Province, but also one from South America. The flowers generally open at dawn, and may be yellow, white, or lavender, often with darker shades at the base. They are usually cup-shaped, thus the common name. The species of sun cup are distinguished by having a club- or head-shaped stigma, instead of the 4-part-divided stigma of Oenothera or Clarkia.
Water:
Sun cup thrives in environments with weekly rainfall, requiring consistent moisture without excessive watering or prolonged dryness. To maintain health, water weekly and keep the soil evenly moist, especially when grown outdoors to benefit from natural precipitation.
Propagation:
Propagation of sun cup typically uses seeds, needing full sun and well-drained soil, with temperatures between 18-24°C (65-75°F). Consider cold stratification to break dormancy. Steps: stratify if needed, sow in well-draining soil, maintain moisture, provide light, and thin seedlings.
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