Tufted Evening Primrose. Oenothera caespitosa, Evening Primrose Family: ( Onagraceae ), Tufted Evening Primrose. Also called: White Evening Primrose, Rock Rose Evening Primrose, or Fragrant Evening Primrose. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Oenothera caespitosa, known commonly as Tufted Evening Primrose, or Fragrant Evening Primrose, is a perennial plant of the genus Oenothera; native to much of western and central North America; as well as parts of Mexico. Tufted Evening Primrose is a very popular xeriscape landscaping plant in Arizona. It is a perennial, up to 10 inches tall and 2 feet in diameter. It produces a rosette of lobed or toothed leaves each up to 36 centimeters long around a woody caudex. The white flowers open in the late afternoon. They close in the morning as temperatures heat up, fading to a pink color. They will not bloom again. This plant is attractive to bees, butterflies and/or birds. There are many subtaxa, referred to as subspecies or varieties of this plant. Quick Notes: Height: Growing to about 12 inches tall and 36 inches wide. Flowers: The flowers are white, about 4" wide, in upper leaf axils; early to mid summer. Flowering Time: Mid March - November. Leaves: Basal rosette, large dark green leaves, 2 - 4" long. Found: Native to the USA (AZ, CA, CO, ID, MT, ND, NE, NM, NV, OR, SD, TX, UT, WA, WY). Native to Canada (AB, MB, SK); and northern Sonora, northern Chihuahua, & Baja California, in Mexico. Hardiness: USDA Zone 3a: to -39.9 �C (-40 �F) USDA Zone 3b: to -37.2 �C (-35 �F) USDA Zone 4a: to -34.4 �C (-30 �F) USDA Zone 4b: to -31.6 �C (-25 �F) USDA Zone 5a: to -28.8 �C (-20 �F) USDA Zone 5b: to -26.1 �C (-15 �F) USDA Zone 6a: to -23.3 �C (-10 �F) USDA Zone 6b: to -20.5 �C (-5 �F) USDA Zone 7a: to -17.7 �C (0 �F) USDA Zone 7b: to -14.9 �C (5 �F) USDA Zone 8a: to -12.2 �C (10 �F) USDA Zone 8b: to -9.4 �C (15 �F) USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 5.6 to 6.0 (acidic) 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 - 7,500 Feet. Naturally at 4500 to 7500 Feet. Does well at lower elevations, but needs some water. Habitat: Alkaline, well-drained/light soils. An ideal xeriscape garden landscape plant in Arizona. Miscellaneous: Flowering Photos Taken March 24, 2003. Glendale, Arizona Public Library, Xeriscape Demonstration Garden.

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