Oenothera biennis

Evening Primrose

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Biennial herb native to North America, known for large yellow evening-opening flowers and high oil content in seeds. Hardy and drought-tolerant once established.
yard Outdoor plants wb_sunny Shade / Half-shade / Sun pets Pet Friendly
info Pot sizes shown are estimations. Real dimensions may vary depending on the merchant.
Merchant Pot Size Availability Price
Amazon.com 2-3 in In Stock $24.00 Buy
info

Plant Details

Common Name Evening Primrose
Family Onagraceae
Genus Oenothera
Species Biennis
Origin North America
Blooming Summer to early autumn, flowers open at dusk
Leaf Color Gray-green / Blue-green
Sunlight Shade / Half-shade / Sun
Category Outdoor plants
Pet Friendly check Yes
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Care & Maintenance

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Soil

Well-draining sandy loam, tolerates poor soils

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Watering

Drought tolerant once established, moderate watering during germination and seedling stage

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Sunlight & Care

Full sun required for best flowering, tolerate partial shade

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Fertilization

Low nutrient requirements, avoid over-fertilizing which promotes leaf growth over flowers

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Pruning

Deadhead spent blooms to encourage further flowering, cut back after frost for winter

Pest Control Aphid Beetle Caterpillar

These are the insects and pathogens that commonly interact with this plant, including pests, parasites, and organisms typically associated with its care.

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Seasonal Periods

local_florist Flowering Period 4 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
agriculture Harvesting Period 3 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
eco Leaf Persistence 12 months
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
thermostat

Growing Parameters

thermostat
Temperature
23° – 95°
Fahrenheit
Ideal ambient air temperature range for healthy growth
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Humidity
40% – 80%
% relative
Optimal relative air humidity the plant thrives in
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Light (LUX)
1000 – 30000
Lux
Ambient illuminance level at the plant's surface
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Light (PAR)
200 – 4500
mmol/m²/s
Photosynthetically active radiation (PAR) intensity
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Soil Moisture
20% – 65%
% volumetric
Water content in the growing medium
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Soil EC
300 – 1500
mS/cm
Electrical conductivity (nutrient concentration in soil water)

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