How to Grow Nuttall's Larkspur
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Nuttall's Larkspur
Delphinium nuttallianum
flowerNuttall's Larkspur is a native wildflower of western North America known for its striking spikes of deep blue to purple flowers. This herbaceous perennial reaches 1-3 feet tall and blooms in late spring to early summer, attracting pollinators with its distinctive hooded flowers arranged in dense racemes.
When should you plant Nuttall's Larkspur in your zone?
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Example Nuttall's Larkspur timeline · Pittsburgh, PA (Zone 6b)
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Plant Nuttall's Larkspur
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Nuttall's Larkspur blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8, with best performance in cooler climates and higher elevations
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Get my Nuttall's Larkspur timeline →Growth Stages
Seedling
2-4 weeksTiny seedlings emerge with two cotyledons, developing their first true leaves over 2-3 weeks
Maintain consistent moisture without waterlogging. Provide bright, indirect light. Keep soil temperature 60-70°F for optimal germination.
Vegetative Growth
4-6 months (first season)Plant develops deep green, deeply lobed foliage in a basal rosette pattern. Height increases gradually with multiple stems forming.
Water regularly but allow soil to dry slightly between waterings. Apply light fertilizer monthly. Thin seedlings to appropriate spacing.
Flowering
4-8 weeksTall spikes emerge from the plant center, densely packed with blue to purple hooded flowers arranged in racemes. Peak bloom is late May through July.
Deadhead spent flowers to encourage secondary blooming. Stake tall varieties in windy locations. Reduce nitrogen to avoid excessive foliage at expense of flowers.
Seed Development
3-4 weeksAfter pollination, flowers fade and follicles develop, swelling as seeds mature. Pods turn brown and papery when ready.
Allow some flowers to remain for seed production if desired. Collect seed pods before they split open and disperse.
Dormancy
4-5 monthsPlant dies back to ground level in fall and winter. The root system remains alive underground, storing energy for spring regrowth.
Cut back dead foliage after frost. Apply light mulch for winter protection in zone 3-4. Reduce or stop watering entirely.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Hand-pick beetles in early morning. Apply neem oil or insecticidal soap. Remove and destroy heavily infested foliage.
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Remove debris and mulch where they hide. Apply copper tape or diatomaceous earth. Hand-pick at dusk.
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Ensure good air circulation. Water at soil level, not overhead. Apply sulfur dust or fungicide if severe. Remove affected leaves.
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Improve drainage with sand or perlite in soil. Avoid overhead watering. Remove and destroy infected plants. Do not compost infected material.
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Isolate infected plants. Increase humidity and temperature to 80°F. Apply horticultural oil or miticide.
Uses
Floral Decoration
CulinaryNuttall's Larkspur flowers are sometimes used as edible garnish in upscale cuisine, though the plant itself is toxic if ingested. The striking blue flowers add visual appeal to salads and desserts when properly verified as pesticide-free. [source]
Cut Flowers and Dried Arrangements
CraftThe tall, graceful spikes make excellent long-lasting cut flowers for bouquets and floral arrangements. Flowers dry beautifully and retain their color when hung upside-down in a dark, dry location, making them ideal for dried flower crafts. [source]
Pollinator Support
WildlifeNuttall's Larkspur is a native wildflower that provides excellent nectar and pollen for bumblebees, hummingbirds, and other pollinators. Growing this plant supports local ecosystem health and biodiversity in western gardens. [source]
Traditional Herbal Use
MedicinalHistorically, Delphinium species were used in traditional medicine for various purposes, though the plant is toxic and modern use is not recommended without professional guidance. Some cultures traditionally used diluted preparations for external applications. [source]
Dye Production
HouseholdDelphinium flowers have been historically used to produce blue dyes for textiles and fabrics. The pigments can be extracted and used in natural dyeing processes for wool and other natural fibers. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Cut flowers for arrangements when the lower 1/3 of the spike has opened but upper buds remain closed. Cut in early morning after dew dries. For seed collection, allow pods to fully mature and turn brown, then cut and place in a paper bag to dry completely before extracting seeds. Self-seeds readily if pods are left on the plant.
Fun Facts
- 🌱 Nuttall's Larkspur is named after botanist Thomas Nuttall, an early 19th-century explorer of North American flora, and is native to meadows and semi-arid regions of the western United States.
- 🌱 The common name 'larkspur' refers to the flower's resemblance to the leg spur of a lark bird—the hooded sepal extends backward like a spur.
- 🌱 All parts of Delphinium are highly toxic to humans and livestock due to toxic alkaloids; a single plant can poison grazing animals, yet native pollinators have evolved tolerance to feed on the nectar safely.
Gardening Terms
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