PlantFiles: Common Evening Primrose, Night Willow-herb, Hoary Evening Primrose Oenothera biennis
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Height: 36-48 in. (90-120 cm) 4-6 ft. (1.2-1.8 m) 6-8 ft. (1.8-2.4 m)
Spacing: 6-9 in. (15-22 cm) 9-12 in. (22-30 cm)
Hardiness: 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)
Sun Exposure: Full Sun
Bloom Color: Bright Yellow
Bloom Time: Mid Summer Late Summer/Early Fall
Foliage: Herbaceous Velvet/Fuzzy-Textured
Other details: May be a noxious weed or invasive Flowers are fragrant Drought-tolerant; suitable for xeriscaping Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Collect seedhead/pod when flowers fade; allow to dry Properly cleaned, seed can be successfully stored
On Jul 9, 2012, WindheartCogs from Siler City, NC wrote:
This is a wonderful plant. Mine came out out a pack of wildflower seeds. It was hardly noticeable the first year, just a small rosette of leaves with a big white vein down the middle. The second year they got taller, and taller, and taller. Luckily they were at the back of my garden, or they would have obscured the whole thing. My only complaint would be that they did get VERY large, and eventually squished the California poppies under them. But by that time, the poppies were out of their prime, and the flowers were well worth it. Bright yellow, fabulously fragrant, numerous, and night blooming, they were just what I was looking for. And they bloom for months. I got to see some pretty neat moths feeding on them too. I had some Japanese beetles snacking on them, but they didn't manage to phase the plants at all. I do see how these could manage to be invasive, so I would be wary of that. But they need no care, and offer wonderful flowers, so are worth the risk in a closely watched garden. Plus, unwanted seedlings pop right out of damp soil.
On Jun 19, 2012, DrJill from East Washington, PA wrote:
Lovely, but verrrrrry tall plant. I put it at the base of my 6 foot chain link deer fence and it is almost that tall. It is contained between walkways [I suspect it could be invasive] but I am not having problems with it. The deer do not seem to like it - so I planted it at the edge of my garden. I enjoy having medicinal plants in my garden.
On May 24, 2009, trioadastra from Ellsworth, WI (Zone 4a) wrote:
I grew this plant as part of a wildflower mixture. It kept getting taller and taller, and looking more like a weed. Finally, at about 5 ft tall, it began to bloom. The flowers themselves are nice, but the size of the plant overwhelms them and leaves much to be desired. Mine did not reseed, and I don't consider it much of a loss.
On Jan 17, 2005, JodyC from Palmyra, IL (Zone 5b) wrote:
Moths pollinate the flowers, particularly Sphinx moths. Other occasional visitors include the Ruby-Throated Hummingbird, honeybees, bumblebees, and Anthedonia compta (Primrose Miner Bee), the latter being an oligolege. These insects seek nectar, although some of the bees collect pollen. The caterpillars of several moths feed on the foliage. This includes Endryas unio (Pearly Wood Nymph), Desmia funeralis (Grape Leaffolder Moth), Hyles lineata (White-Lined Sphinx), and Mompha eloisella (Momphid Moth; bores through stems). Various beetles feed on the foliage, including Popillia japonica (Japanese Beetle), Grahops pubescens (Leaf Beetle sp.), Altica fusconenea (Flea Beetle sp.), and several Curculio beetles. The seeds are eaten by goldfinches.
On Sep 20, 2004, txbabycat from Flower Mound, TX wrote:
I purchased a pack of mixed wild flowers and some of these came up last year. During the winter here in Texas, which is mild, but it does get cold, the green leaves part of the plant stayed alive all winter long being low to the ground. WIth the onset of spring this year they shot up to about 3-4 feet tall and produced a lot of flowers all summer. They were under a shade tree and received partial shade and some sun. You do have to watch for the aphids, they seem to love this plant. You can contol them with a soapy water mixture sprayed on the plant.
On Sep 3, 2004, WillowWasp from Jones Creek, TX (Zone 9a) wrote:
This plant grows in the Dunes at the beach. It seems to do very well there and is doing a part in keeping the sand from blowing where it's pretty thick. It dosen't seem to be effected by the salt water or spray. Some of it is pretty close to the surf and it has been growing there for quite some time and it is flowering and sending out more runners..
On Aug 16, 2004, cherishlife from Pocola, OK (Zone 7a) wrote:
Evening primrose is a biennial plant with numerous, crinkled, lance-shaped leaves and green stems with red splotches. The flowers on this plant were found blooming on a cloudy day, but commonly only bloom early morning or evening. Flowers are bright yellow, fragrant with four broad petals. This plant was found growing alongside a country road and stands about 7 feet tall. Flowers are produced all along the stalk and bloom is continuous from June through autumn.
Evening primrose was used by the North American Indians for a variety of medical problems. This plant is grown commercially for its seed oil which is rich in GLA (gamma linoleic acid) fatty acids; cis-linoleic (70%), cis-gammalinolenic acid (9%).
Above ground parts are thought to have astringent properties, used to treat whooping cough, digestive problems, asthma etc; oil has been applied externally to treat itchy skin conditions, internally to lower blood pressure, prevent clumping of the platelets, premenstrual problems. Dangerous to take if suffering from epilepsy.
Most of my information was taken from the Ontario Ministry of Agriculter and Food
This plant has been said to grow in the following regions:
Grenoble, Lake Purdy, Alabama Blytheville, Arkansas Amesti, California Berkeley, California Crescent City North, California Merced, California Trenton, Florida Demorest, Georgia Lewiston, Idaho Albion, Indiana South Whitley, Indiana Des Moines, Iowa Prospect, Kentucky Lisbon, Maine Cresaptown-bel Air, Maryland Loch Lynn Heights, Maryland Millersville, Maryland Riverside, Maryland Valley Lee, Maryland Amesbury, Massachusetts Cordaville, Massachusetts Millbury, Massachusetts Belleville, Michigan Erie, Michigan Owosso, Michigan Pinconning, Michigan Saint Helen, Michigan Tawas City, Michigan Minneapolis, Minnesota Woodland, Minnesota Cole Camp, Missouri New Milford, New Jersey East Patchogue, New York Glen Cove, New York Rotterdam, New York Seaford, New York Raleigh, North Carolina Siler City, North Carolina Glouster, Ohio New Miami, Ohio Pleasantville, Ohio Pocola, Oklahoma East Washington, Pennsylvania Fullerton, Pennsylvania Millersburg, Pennsylvania Philadelphia, Pennsylvania West Goshen, Pennsylvania , Saskatchewan Centertown, Tennessee Dalworthington Gardens, Texas De Leon, Texas Fort Worth, Texas Kaufman, Texas Merrimac, Virginia Ellsworth, Wisconsin