Siskiyou Evening Primrose
Oenothera speciosa 'Siskiyou'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
10 inches
Width
24 inches
Light
Full Sun, Partial Sun
Zones
4, 5, 6, 7, 8, 9
Water
Low to moderate
Humidity
Prefers dry to moderate humidity
Lifespan
Perennial
Native To
North America
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
A hardy perennial known for its charming pink flowers and ability to thrive in various soil types. The Siskiyou cultivar is particularly noted for its abundant flowering and compact growth habit.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds into well-drained soil in early spring for best germination.
- Mist cuttings regularly to maintain humidity and encourage root growth.
- Water consistently during the growing season, avoiding waterlogging.
- Fertilize with a balanced liquid feed every 4-6 weeks during active growth.
- Prune dead or damaged stems in late winter to promote healthy growth.
- Divide clumps in early spring or fall for propagation and revitalization.
Pro Tip
Sow seeds directly outdoors for natural growth and vibrant blooms.
Keep It Thriving
Care Guide
Do
- Provide full sun for optimal flowering 🌞
- Water regularly, especially during dry spells 💧
- Use organic compost to enrich soil
- Deadhead spent flowers to encourage more blooms
- Mulch to retain soil moisture and suppress weeds
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t disturb roots during peak flowering
- Refrain from fertilizing in late fall
- Avoid planting in shaded areas
- Don’t ignore pest signs or disease symptoms
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Divide | ||||||||||||
| Plant | ||||||||||||
| Prune | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Siskiyou Evening Primrose questions
What zones can Siskiyou Evening Primrose grow in?
Siskiyou Evening Primrose is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Siskiyou Evening Primrose deer resistant?
Yes — Siskiyou Evening Primrose is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Siskiyou Evening Primrose bloom?
Siskiyou Evening Primrose typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Siskiyou Evening Primrose need full sun?
Siskiyou Evening Primrose does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Siskiyou Evening Primrose drought tolerant?
Yes — once established (usually after the first full season), Siskiyou Evening Primrose handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Oenothera to compare
Pink Evening Primrose
Oenothera speciosa
Missouri Evening Primrose Giant Evening Primrose
Oenothera macrocarpa
Evening Primrose
Oenothera biennis
Sundrops
Oenothera fruticosa 'Native Yellow Bellflower'
Ozark Sundrop
Oenothera missouriensis 'Ozark Sundrop'
Tufted Evening Primrose
Oenothera caespitosa
Keep exploring
Explore the genus
Collections featuring this plant
Grow Siskiyou Evening Primrose with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
