Candle larkspur (Delphinium elatum)

Also known as: Bee larkspur, Alpine delphinium

Delphinium elatum is a striking ornamental plant, known for cultivars such as 'Magic Fountains', 'Dwarf Pacific', 'New Millennium', 'Pacific Giant', and several varieties of 'Aurora'. The scientific name Delphinium elatum was first attributed by Carl Linnaeus, the Swedish botanist, in 1753.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Candle larkspur

Lifespan

Perennial, Annual

Plant Type

Herb

Plant Height

70 cm to 1.3 m

Spread

30 cm

Leaf Color

Green Blue

Flower Size

2.5 cm to 5 cm

Flower Color

Blue White Pink Purple

Images of Candle larkspur

Quickly Identify Candle larkspur

Tall spikes with deeply saturated blue flowers and prominent spurs.

Leaves are blue-green, deeply lobed with elegant pointed segments.

Upright, sturdy stem ranging from green to faint purple, hollow and straight.

Flowers arranged in central racemes, blue-violet, 1-2 inches in diameter.

Distinctive palmate leaf form, hand-like appearance with 5-7 lobed segments.

Scientific Classification of Candle larkspur

Phylum

Vascular plants

Class

Dicotyledons

Order

Buttercups, poppies and allies

Family

Buttercup

Genus

Larkspurs

Species

Candle larkspur

Planting and Growing of Candle larkspur

Care Difficulty

Hard

Watering Schedule

Every 8 days

Sunlight Requirements

Full sun

Sunshine Duration

6-10 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Candle larkspur?

For Delphinium elatum, the watering amount should ensure the soil is moist but not waterlogged. Water around 300 ml each time to allow the roots to absorb moisture without drowning.

What are the symptoms of an underwatered Candle larkspur? ›

What should I do if my Candle larkspur is not getting enough water? ›

What are the symptoms of an overwatered Candle larkspur? ›

How to save an overwatered Candle larkspur? ›

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What Are the Sunlight Requirements for Candle larkspur?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6 to 8 hours daily

Delphinium elatum flourishes in areas with full sun to partial sun, ideally 6-8 hours a day. Adequate light fosters robust flowering and supports the plant's development by ensuring it receives enough energy for photosynthesis without overextending its stress limits.

What is the ideal location for Delphinium elatum? ›

How can I optimize light conditions during different seasons? ›

What steps should I take if my garden doesn't offer ideal sun exposure? ›

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What Is the Ideal Temperature Range for Candle larkspur?

Ideal Temperature: 60 ~ 75℉

Delphinium elatum thrives best in temperatures ranging from 60°F to 75°F. This range ensures that the plant can perform essential physiological functions while minimizing stress. Growth in this temperature range typically results in robust blooms and healthy foliage.

What Soil is Best for Candle larkspur?

Soil type: Loam, Sandy loam

Soil PH: 6.5 ~ 7.5

Delphinium elatum thrives in well-draining soil, which prevents waterlogging and root rot. This type of soil ensures that the roots get the oxygen they need, leading to healthier and more vibrant plants. A nutrient-rich soil provides essential minerals and nutrients necessary for the robust growth of Delphinium elatum. This supports its tall flower spikes and vibrant blooms, which are a staple of this striking plant. While well-drained, the soil should also retain some moisture to support steady growth without overnight drying. This balancing act is crucial to maintain the plant's hydration, particularly during warmer periods. More About Soil→

How to Fertilize Candle larkspur?

Fertilizer type: Balanced

Delphinium elatum requires a balanced approach when it comes to fertilization. Ideally, use a balanced 10-10-10 liquid fertilizer at a dilution of half the recommended strength for regular feeding. For slow-release fertilizers, use 2-5 pounds per square foot of a granular type and ensure it's evenly spread for optimal root absorption. More About Fertilizing Techniques→

How to Prune Candle larkspur?

Pruning Time: Spring, Summer, Autumn

Begin by removing damaged or dead stems to encourage fresh growth. Trim the plant back to about 6 inches above the soil level. This not only helps in directing energy to new shoots but also promotes a robust structure for the season. During summer, 'deadhead' spent blooms to encourage further flowering. Cut the flower stalks back to the nearest set of leaves after the first flush of flowers fades to promote continued blooming. In autumn, cut back all stems to just above ground level after the foliage has died back. This tidies up the garden for winter and reduces the risk of disease harboring over the colder months. More About Pruning Techniques→

How to Propagate Candle larkspur plant?

Propagate Time: Spring, Early spring, Late spring

Collect seeds from mature Delphinium elatum plants. Soak them in water overnight to improve germination rates, especially important as the seeds have hard coatings.

Fill a seed tray with moist seed-starting mix and distribute the seeds evenly. Cover them lightly with soil, place the tray in a well-lit area, and maintain consistent moisture.

In early spring, dig up established plants and carefully separate the root clumps into sections with several buds each. Replant them immediately at the same soil depth.

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How to Repot Candle larkspur plant?

Repotting frequency: Every 2-3 years

Delphinium elatum typically needs repotting when you notice roots emerging from the drainage holes or the plant becomes root-bound. Another sign is when the plant's growth appears stunted, despite proper care. Generally, repotting every 2-3 years in spring or autumn ensures healthy growth.

Select a pot that is approximately 1-2 inches larger in diameter than the current one. The material can be terracotta or ceramic for better aeration, which helps prevent overwatering issues. A pot with drainage holes is essential to avoid waterlogging and root rot.

Opt for a well-draining potting mix enriched with organic matter. This type of soil provides essential nutrients and prevents water retention, which can lead to root diseases. A mix designed for flowering plants often works well with Delphinium elatum.

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Toxicity of Candle larkspur

Is Candle larkspur toxic to humans?

Candle larkspur possesses a moderate to high level of toxicity to humans due to its alkaloid compounds. While all parts of this plant are toxic, extra vigilance is particularly necessary during its early growth stages, as this is when it harbors the highest concentration of harmful substances, making it exceptionally dangerous. Consuming candle larkspur may lead to serious gastrointestinal complications, a decrease in heart rate and blood pressure, as well as potential respiratory failure. Ingestion can be lethal due to its impact on both the cardiovascular and neuromuscular systems. Additionally, physical contact with the plant can cause skin irritation.

Is Candle larkspur toxic to cat?

Candle larkspur poses a notable threat to the well-being of cats, categorized under a broad classification of toxicity. If a cat consumes any portion of candle larkspur, which is entirely poisonous, it may show various signs of distress. Ingestion can occur accidentally, as a cat’s natural curiosity may lead to unintentional eating. Following poisoning, cats might exhibit symptoms that indicate physical discomfort, which may include gastrointestinal disturbance and neurological issues. To protect feline health, swift action is crucial; any suspicion of candle larkspur ingestion necessitates immediate veterinary care to ensure a prompt and appropriate reaction to the poisoning.

Is Candle larkspur toxic to dog?

Candle larkspur is a plant that presents a considerable health hazard to dogs due to its toxic properties. Any part of the plant is deemed poisonous, which puts dogs at risk if they consume it. Symptoms may arise in dogs following ingestion of candle larkspur, including gastrointestinal distress, muscle tremors, and heart complications. It is essential for dog owners to restrict their pets from entering areas where candle larkspur proliferates and to remain alert for any pieces of the plant that could accidentally enter their homes. Should a dog be suspected of consuming candle larkspur, it is vital to seek prompt veterinary attention to ensure the highest potential for recovery for the animal.

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.

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