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PlantSnap
Plant Care
Poison larkspur
(Delphinium trolliifolium)
Also Known As
Poison larkspur, Trollius larkspur, Trollius delphinium
About This Plant
Delphinium trolliifolium is a species of flowering plant in the family Ranunculaceae, native to the western United States. It is a herbaceous perennial that grows up to 1.5 m tall. The plant produces tall spikes of blue-violet flowers in summer.
Plant Care Instructions
Outdoor Size Range
24-36 inches (61-91 cm) tall, 12-18 inches (30-46 cm) wide
Light Requirements
Delphinium trolliifolium prefers full sun to partial shade. It needs at least 6 hours of direct sunlight per day.
Humidity Needs
Delphinium trolliifolium prefers moderate humidity levels. If the air is too dry, mist the plant regularly.
Fertilizing Schedule
Fertilize the plant once a month during the growing season with a balanced fertilizer. Do not fertilize during the winter months.
Pruning Guidelines
After the plant has finished flowering, cut back the stems to the base of the plant. This will encourage new growth and prevent the plant from becoming leggy.
Common Pests and Diseases
Common pests for Delphinium trolliifolium include aphids, slugs, and snails. Diseases such as powdery mildew and crown rot can also affect the plant.
Indoor Size Range
N/A
Watering Schedule
The plant requires regular watering, especially during the growing season. Keep the soil moist, but not waterlogged. Water deeply once a week.
Temperature Range
The plant prefers cool to moderate temperatures. It grows best in temperatures between 60-70°F (15-21°C).
Growing Season
The growing season for Delphinium trolliifolium is from spring to fall.
Growing Difficulty Level
Delphinium trolliifolium is moderately difficult to grow. It requires regular watering and fertilizing, and is susceptible to pests and diseases.
USDA Hardiness Zones
Delphinium trolliifolium is hardy in USDA zones 3-8.
Did You Know?
Delphinium trolliifolium is commonly known as Trollius-leaved Larkspur because its leaves resemble those of the Trollius plant genus.
