Turf Weeds was developed to provide weed management information and newsearch reports to turfgrass managers.  This site contains information on weed identification, chemical and cultural management of weeds, and current topics relevant to weed management in lawns and professional turf.  Turf Weeds was created  by Dr. Shawn Askew, Assistant Professor of Turfgrass Weed Science at Virginia Polytechnic Institute & State University.
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Plant Description:
Name:common eveningprimrose
Scientific Name:Oenothera biennis
Family:Onagraceae
Type:Broadleaf
Lifecycle:Perennial
Habit:Common eveningprimrose can be found in dry soils, meadows and open places. They are often planted in perennial gardens.
Leaves:Leaves are rough-hairy, narrow, and pointed, arranged in a rosette. They are opposite on the stem, with branches often reddish.
Leaf Arrangement:Rosette
Characteristics:Eveningprimrose gets its name from its unusual behavior. The flowers open in the evening between 4:00 and 10:00 pm. It releases its sweet fragrance and attracts many night-flying moths after it opens. Oil produced by eveningprimrose seeds is now being used for experimental medicinal purposes. Scientists could prove it useful for treating disorders such as exzema, migraine headaches, asthma, arthritis, and alcoholism.
Flower Seed Head:Flowers grow from June to September. Flowers are yellow, with 4 petals, and an X-shaped stigma in the center of the flower. They have reflexed sepals, arranged all around the leafy stalk.
Seed Fruit:<br />
Where Found:Common Evening Primrose can be found throughout the US.

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