Whitest Evening Primrose (Oenothera albicaulis)

Also known as: Prairie Evening- Primrose, Pale Evening-primrose

Prairie evening-primrose, scientifically named *Oenothera albicaulis*, is a plant species indigenous to the United States and Mexico. The Zuni people have historically utilized this plant in their rain ceremonies.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting

Attributes of Whitest Evening Primrose

Lifespan

Annual, Biennial, Perennial

Plant Type

Herb

Plant Height

15 cm to 30 cm

Spread

30 cm

Leaf Color

Green Blue

Flower Size

6 cm

Flower Color

White Pink Cream

Images of Whitest Evening Primrose

Quickly Identify Whitest Evening Primrose

To identify Oenothera albicaulis, look for its white to pale green stems, yellow four-petaled flowers that open in the evening, and its lance-shaped leaves. It often grows in well-drained, sandy soils.

Scientific Classification of Whitest Evening Primrose

Phylum

Vascular plants

Class

Dicotyledons

Order

Myrtales

Family

Evening primrose

Genus

Evening Primrose

Species

Whitest Evening Primrose

Planting and Growing of Whitest Evening Primrose

Care Difficulty

Easy

Watering Schedule

Every 4 days

Sunlight Requirements

Full sun

Sunshine Duration

6-10 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Whitest Evening Primrose?

Oenothera albicaulis, commonly known as prairie evening-primrose, requires moderate watering. Ensure the soil is soaked to a depth of about 10 inches, but avoid puddling. The key is to mimic natural rainfall conditions, providing sufficient moisture without waterlogging.

What are the symptoms of an underwatered Whitest Evening Primrose? ›

What should I do if my Whitest Evening Primrose is not getting enough water? ›

What are the symptoms of an overwatered Whitest Evening Primrose? ›

How to save an overwatered Whitest Evening Primrose? ›

What Are the Sunlight Requirements for Whitest Evening Primrose?

Sunlight Requirements: Full sun

Duration of light: 6 to 8 hours

Oenothera albicaulis thrives under full sun, enjoying 6 to 8 hours of sunlight. Ideal lighting conditions promote vigorous growth, an abundance of blooms, and generally enhanced plant vitality.

What is the best lighting condition? ›

How can I ensure my plant gets ideal sunlight? ›

What benefits from ideal light conditions? ›

More About Sunlight Requirements Techniques→

What Is the Ideal Temperature Range for Whitest Evening Primrose?

Ideal Temperature: 60 ~ 75℉

For optimal growth, Oenothera albicaulis prefers a temperature range between 60 and 75°F. This range supports its physiological processes, promoting healthy leaf, stem, and root development. Maintaining the plant within this temperature bracket ensures vibrant blooms and longevity.

What Soil is Best for Whitest Evening Primrose?

Soil type: Sandy soil, Loam

Soil PH: 6.5 ~ 7.5

Oenothera albicaulis thrives in well-drained soils, ensuring that the roots do not sit in water, which can lead to rot. Proper drainage maintains root health and supports vigorous growth. Although this plant can tolerate poorer soils, providing a nutrient-rich medium will enhance its flowering. The presence of essential nutrients leads to more robust blooms and overall plant vitality. While drought-tolerant once established, Oenothera albicaulis benefits from moderate soil moisture levels. Adequate water content during the initial growth stages ensures strong establishment and lush foliage.

How to Fertilize Whitest Evening Primrose?

Fertilizer type: Balanced

For Oenothera albicaulis, it is important to use a balanced fertilizer, preferably one that is formulated for flowering plants. Dissolve approximately 10 milliliters of liquid fertilizer in a liter of water for each application. Solid fertilizers should be applied sparingly, using about 50 grams per square meter, ensuring the surrounding soil is moistened after application.

How to Prune Whitest Evening Primrose?

Pruning Time: Spring, Summer, Autumn

Begin by removing any dead, diseased, or damaged stems using clean, sharp scissors or pruners. Make sure to cut at a 45-degree angle about a quarter inch above a healthy node or bud. This encourages new growth and prevents water from collecting on the cut, which can hinder recovery. More About Pruning Techniques→

How to Propagate Whitest Evening Primrose plant?

Propagate Time: Spring, Early summer

Fill the seed tray with a good-quality potting mix, leaving about 1 cm from the rim to the soil surface to allow for watering. Ensure the soil is evenly spread and lightly firm it down to provide a stable base for the seeds.

Scatter the seeds of Oenothera albicaulis evenly over the surface of the soil. Lightly press the seeds into the soil without covering them too deeply; seeds typically require light to germinate, so a gentle pressing ensures they remain in contact with the compost. Moisten the soil with a light spray to avoid displacing the seeds.

Cover the tray with a transparent lid or plastic wrap to maintain humidity, important for successful germination. Place the tray in a warm, bright spot away from direct sunlight, ideally between 20-22°C. Check regularly for signs of germination and ensure the soil remains moist but not waterlogged.

More About Propagating Techniques→

How to Repot Whitest Evening Primrose plant?

Repotting frequency: Every 2-3 years

It's time to repot your Oenothera albicaulis when you notice its roots starting to grow out of the drainage holes of the pot or if the plant has visibly slowed its growth. Ideally, repot in spring or autumn when temperatures are mild.

Choose a pot that is one size larger than the current one and ensure it has sufficient drainage holes. A slightly larger pot allows room for root expansion, which is crucial for plant health, while proper drainage prevents root rot.

Select a well-draining loamy soil mix for repotting. Such a soil structure provides the perfect balance of moisture retention and drainage, which is essential for preventing waterlogged roots and promoting healthy growth.