Siskiyou Evening Primrose
Oenothera berlandieri 'Siskiyou'
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Siskiyou Evening Primrose - #1 Container is backordered and will ship as soon as it is back in stock.
Plant Sentry™
Plant Sentry™
Plant Sentry is designed to protect both consumers and the nursery trade from invasive plant pests and diseases. Sites that display the Plant Sentry protection badge are protected from consumers buying and nurseries shipping material carrying invasive pests and diseases.
This proprietary eCommerce software prevents the shipment of a restricted plant to each state. The Plant Sentry system includes a shipment certification program. The Plant Sentry Compliance Officer works closely with NatureHills.com and each nursery or fulfillment center to ensure only compliant plants are sold to customers.
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Delivery and Shipping
Delivery and Shipping
Shipping
To obtain a more accurate shipment time-frame, simply enter your zip code in the “Find Your Growing Zone” box to the right. Our plants are grown all over the country and lead time on items may be different because of this. Once your order is placed, you will also receive the specific shipment time-frame information as part of your order confirmation. Once an item ships, you will receive shipment notification and tracking numbers, so you can follow along while your plant travels to your doorstep. We use FedEx, UPS, or USPS at our discretion.
Due to winter weather we have put a hold on shipping to the areas shown below in grey. You can still order now and we will ship the plant to you during an appropriate time for your zone.
Standard Shipping Rates
At Nature Hills we handle, package and ship the products you order with the utmost care to ensure healthy delivery. Shipping and handling charges are calculated based on the tables below. Please note that some items include an additional handling surcharge, these will be noted on the item's product page.
| From | To | S&H |
|---|---|---|
| $0 | $19.99 | $24.99 |
| $20 | $49.99 | $29.99 |
| $50 | $69.99 | $34.99 |
| $70 | $99.99 | $39.99 |
| $100 | $129.99 | $44.99 |
| $130 | $149.99 | $48.99 |
| $150 | $150+ | Approx 28% |
Click here to see our full rates
Understanding Plant Options
Nature Hills offers plants in two main formats:
- Container Plants: Grown in pots with soil, sized by container volume and plant age
- Bare Root Plants: Dormant plants without soil, sized by height measurements
Container Plant Sizes
Container sizes indicate plant age and growing capacity rather than liquid volume equivalents. Our containers follow industry-standard nursery "trade gallon" specifications, which differ from standard liquid gallon measurements.
Young Plants (6 months to 18 months old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| 2" x 2" x 3" | 0.18 - 0.21 dry quarts | 0.20 - 0.23 dry liters |
| 4" Container | 0.31 - 0.87 dry quarts | 0.35 - 0.96 dry liters |
| 4.5" Container | 0.65 dry quarts | 0.72 dry liters |
| 6" Container | 1.4 dry quarts | 1.59 dry liters |
| 1 Quart | 1 dry quart | 1.1 dry liters |
| 5.5" Container | 1.89 dry quarts | 2.08 dry liters |
Established Plants (18 months to 2.5 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| 2 Quart | 2 dry quarts | 2.2 dry liters |
| #1 Container | 2.26 - 3.73 dry quarts | 2.49 - 4.11 dry liters |
| 5" x 5" x 12" | 3.5 - 4.3 dry quarts | 3.85 - 4.74 dry liters |
Mature Plants (2-4 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| #2 Container | 1.19 - 1.76 dry gallons | 5.24 - 7.75 dry liters |
| #3 Container | 2.15 - 2.76 dry gallons | 8.14 - 12.16 dry liters |
Large Plants (3-5 years old)
| Container Size | Actual Volume | Metric Equivalent |
|---|---|---|
| #5 Container | 2.92 - 4.62 dry gallons | 12.86 - 20.35 dry liters |
| #6 Container | 5.25 - 6.01 dry gallons | 23.12 - 26.42 dry liters |
| #7 Container | 5.98 - 6.53 dry gallons | 26.34 - 28.76 dry liters |
Bare Root Plants
Bare root plants are sold by height from the root system to the top of the plant. Plants may exceed minimum height requirements.
Common Sizes:
- Trees: 1 foot, 2 feet, 3 feet, 4 feet, 5 feet, 6 feet
- Shrubs & Perennials: 1 foot, 18 inches, 2 feet
Important Notes
Container Volume Specifications
- Trade Gallon Standard: Our containers follow industry-standard "trade gallon" specifications established by the American National Standards Institute (ANSI Z60.1) for nursery stock
- Volume Variations: Actual soil volume may vary due to plant root systems and growing medium settlement
- Age Indicators: Container size primarily indicates plant age and maturity rather than liquid volume equivalents
Growing Conditions
- Plant size can vary based on variety and growing conditions
- Container size helps indicate plant maturity and establishment level
- Larger containers generally mean more established root systems and faster landscape establishment
Seasonal Availability
- Bare root plants are available seasonally when dormant
- Container plants are available throughout the growing season
- Specific varieties may have limited availability in certain sizes
Questions?
For questions about specific plant sizes or availability, please contact our plant experts who can help you choose the right size for your landscape needs.
Plant Highlights
Siskiyou Evening Primrose highlights at a glance!
Specifications
Specifications
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Brand
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Botanical Name
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Growing Zones
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Mature Height
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Mature Spread
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Sun ExposureFull Sun
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Moisture
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Soil
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Growth RateMedium
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Flower Color
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Pollinator Friendly
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Pruning Time
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Bloom PeriodSummer
Growing Zones 5-8
Pink Butterflies All Summer
Evening Primrose 'Siskiyou' (Oenothera berlandieri 'Siskiyou') is a ground-hugging beauty with fragrant, pale pink blooms that flutter like butterfly wings. From June through September, this low-maintenance perennial offers months of continuous blooms, each cup-shaped flower measuring up to 3 inches across and veined like delicate wings that seem to glow when backlit by the sun.
Native to the Southern Plains and Southwestern U.S., this improved Evening Primrose handles heat, drought, and poor soils with ease. Ideal for USDA hardiness zones 5 through 8, it thrives in tough spots where other plants struggle. Making it a shining star in xeriscapes, sunny borders, and Rock Gardens.
>>Jump to Planting & Care Instructions
Key Features
- Fragrant 3-inch pale pink blooms with butterfly-wing veining
- Extra-long bloom time from June through September
- Compact, tidy, ground-hugging growth under 12 inches tall
- Spreads by underground runners. Great for naturalizing
- Thrives in poor, dry soil and full sun
- Native perennial perfect for pollinators
- Drought and heat-tolerant once established
Landscaping Uses
With its spreading habit and compact height, Siskiyou is a garden multitasker, softening edges and adding a dreamy pink glow wherever you plant it. It’s a perfect fit for sunny spots and dry soils.
- Front of sunny borders or cottage gardens
- Naturalizing slopes or curbsides
- Edging along pathways and driveways
- Filling gaps between stepping stones or rocks
- Tucking into containers and shallow planters
- Pollinator or wildflower gardens
- Hell strips and other dry, neglected spots
Care and Maintenance
This herbaceous perennial forms a spreading mat of narrow, slightly toothed foliage on reddish stems. It blooms on new growth and is best when not pampered. No rich soil or soggy spots needed here. Siskiyou is perfect for anyone looking for a perennial that looks delicate but behaves like a champ.
- Planting Time: Spring or fall
- Sun Needs: Full sun
- Soil Needs: Lean, well-drained soil; dislikes overly rich or wet conditions; tolerates clay and sandy sites
- Moisture Needs: Low once established; water deeply but infrequently
- Mulch: Apply 3-4 inches of bark or arborist mulch to suppress weeds and conserve moisture
- Fertilization Needs: None needed; thrives in poor soils
- Pruning Info: Deadhead spent flowers to encourage reblooming; trim back lightly to shape
- Special Needs/Perks/Growing Tips and Tricks For Success:
- Deer and rabbit resistant
- Extremely drought- and heat-tolerant,
- Thrives in poor soil and pH adaptable
- Division Info: Divide in early spring every few years to control the spread and refresh the growth
A Blooming Good Groundcover Choice
Like pink butterflies fluttering across your garden floor, 'Siskiyou' Evening Primrose delivers a glowing pink carpet of blooms in the heat of summer. It’s hardy, head-turning, and hummingbird-approved. Bring its long bloom time and tidy form into your sunny garden today. Buy yours today!
Frequently Asked Questions
Is Siskiyou Evening Primrose invasive?
It spreads by underground runners but is not considered invasive. It’s easy to manage with regular division or edging.
How tall and wide does it get?
It stays under 12 inches tall and can spread up to 12 inches or more.
Does it need a lot of water?
Nope! Once established, it thrives on low moisture and is highly drought-tolerant.
What kind of soil does it prefer?
Lean, well-drained soils. Avoid overly rich or wet areas.
Can I use it in a container?
Yes, it grows well in shallow pots with good drainage and full sun.
How often do I need to divide it?
Every 2-3 years in early spring, to maintain its shape and vigor.
Can it tolerate heat and poor soils?
Absolutely. It was made for tough, sunny locations.
What USDA zones is it hardy in?
Hardy in USDA zones 5 through 8.
Why Order From Nature Hills Nursery?
Nature Hills Nursery is committed to bringing the highest-quality plants to your door. Join thousands of happy customers and get all your planting needs at Nature Hills! We guarantee our plants for their first year! Check out lifelong support and landscaping ideas in our #ProPlantTips Garden Blog!
