Water
Keep the soil consistently moist, especially during active growth and flowering. Water at the base of the plant to prevent fungal diseases on foliage. Reduce watering in late autumn as the plant naturally declines.
Also known as Aed-Varesjalg (et) · Cultivated Delphinium · Larkspur
Safety note: This plant may be toxic to humans and pets. See toxicity details.
Doubtful Knight's-Spur (Delphinium ajacis) is an annual flowering plant known for its tall spikes of vibrant blue, pink, or white flowers. It adds vertical interest and c
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
75% intensity
Prefers at least 6-8 hours of direct sunlight daily for best flowering.
Consistent Moisture
50% intensity
Avoid waterlogged conditions, ensure good drainage.
Well-drained, fertile soil
50% intensity
Cool to Moderate
50% intensity
Thrives in temperatures between 15-20°C. Can tolerate some heat but may require more water.
Moderate
50% intensity
Balanced fertilizer during growth, lower nitrogen when flowering.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | Yes 5/5 intensity |
| Toxic for pets | Yes 5/5 intensity |
| Edible | No |
All parts of the plant are toxic, especially the seeds. Contains alkaloids, including delphinine, which can cause gastrointestinal upset, respiratory distress, and cardiac issues.
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Keep the soil consistently moist, especially during active growth and flowering. Water at the base of the plant to prevent fungal diseases on foliage. Reduce watering in late autumn as the plant naturally declines.
Deadhead spent flowers regularly to encourage more blooms and prevent seed formation. Cut back the plant after flowering to tidy its appearance and allow energy to be stored for the following year, though it is often treated as an annual.
Sow seeds directly outdoors in early spring or late autumn. For earlier blooms, start seeds indoors 6-8 weeks before the last frost.
Seeds require light to germinate, so sow them on the surface of the soil and do not cover.
Delphinium ajacis is typically grown as an annual and does not usually require repotting. If grown in containers and needing a larger pot, transplant in spring before significant new growth appears.
Handle the root ball gently.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Doubtful Knight's-Spur (Delphinium ajacis)
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Ranunculales |
| Family | Ranunculaceae |
| Genus | Delphinium |
| Species | Delphinium ajacis |
Similar in genus Delphinium
Answers based on plant encyclopedia data
