Perennials
Delphinium trolifolium (. Poison Delphinium)
Delphinium trolliifolium
Also known as Columbia Larkspur (Poison Larkspur)
Size
Available at our Langlois nursery
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About This Plant
Delphinium trolifolium (. Poison Delphinium), '. Poison Delphinium', is valued for seasonal interest and the role it plays in PNW garden borders.
Delphiniums are classic cottage-garden perennials with tall flower spikes in blue, purple, white, or pink. Best in cool-summer climates like the PNW.
Full sun to part shade suits this species. Plant in moist, well-drained, fertile, alkaline soil. Hardy USDA Zone 3 to 7. ALL PARTS TOXIC. Stake tall stems. Cut back after first flush for repeat bloom.
For a Pacific Northwest native perennial of similar character, consider Aquilegia formosa (Western Red Columbine), Tellima grandiflora (Fringecups), or Dicentra formosa (Pacific Bleeding Heart) , all support native pollinators.
Plant Details
- Botanical
- Delphinium trolliifolium
- Common name
- Columbia Larkspur (Poison Larkspur)
- Lifecycle
- Perennial
- Foliage type
- Deciduous
- Mature size
- 3-5 ft tall × 1-2 ft wide
- Growth rate
- Fast
- Bloom time
- Late spring to early summer
- Bloom color
- Blue, Purple, White, Pink
- Foliage color
- Green
Care Notes
Garden Attributes
- Pacific NW native
- Deer resistant
- Coastal suitable
- Grown organically
- Pollinator value: Bumblebees, Hummingbirds
- Wildlife: Pollinator support, Hummingbird nectar
- ⚠ Toxic to pets if ingested
- ⚠ Toxic to humans if ingested
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Our inventory changes with the seasons. Before you drive out, give us a call or text, we'll confirm availability and can hold a plant for you.