Eazy Gardening

Candle Larkspur: Beauty and Adaptability in Perennial Growth

Delphinium elatum ‘Sweethearts’ or commonly known as Candle Larkspur, is a popular perennial flower that belongs to the buttercup family, Ranunculaceae. This ornamental plant is widely grown in gardens and landscapes, and its beautiful flowers are an excellent choice for cut flowers.

In this article, we will explore the essential information about this stunning plant, such as its description, characteristics, cultivation, and maintenance tips.

Overview of the plant

Candle Larkspur is known for its beautiful, vibrant blue flowers that bloom on tall spikes. It is a herbaceous plant that typically grows up to three to six feet tall, with a spread of one to two feet.

The plant’s leaves are deeply lobed, and the foliage is a light green color. The plant’s upright habit emphasizes its vertical lines in the garden and adds a touch of elegance.

Candle Larkspur is also known by various vernacular names, such as Bee Larks, Imperial Larkspur, and Alpine Delphinium. However, it is popularly called Candle Larkspur due to its tall stem-like structure, which makes the flowers seem like candles when they bloom.


Candle Larkspur blooms in mid-summer and can continue to bloom into early fall. The blue blooms are the plant’s most attractive feature, with varieties such as ‘Sweethearts’ bearing gentle pink shades.

The flowers are fluffy with soft petals, and they grow densely along the plant’s spike-like stem. The plant’s blooms also attract bees, butterflies, and hummingbirds, which makes it a great choice for a pollinator garden.

Candle Larkspur is hardy and can tolerate cold temperatures as low as -30F. However, too much heat or too little water can cause it to wilt.

For that reason, it is best to plant this flower in zones three to seven, where the weather is neither too hot nor too cold.

Plant cultivation and care

Candle Larkspur can be propagated from seeds or cuttings. However, growing it successfully requires some basic knowledge.

Here are the essential cultivation and care tips to bear in mind:

Preferred growing conditions

Candle Larkspur prefers full sun with at least six hours of direct sunlight and well-drained fertile soil. It is best to plant Larkspur in the middle of spring when the soil is cool but workable.

Be sure to enrich the soil with compost and organic matter to promote healthy growth.

Potential pest and disease issues

Candle Larkspur faces several pest and disease issues. The most common pests that affect Candle Larkspur are aphids and snails, which can be controlled by introducing beneficial insects like ladybugs into the garden.

Diseases like powdery mildew and botrytis can harm Candle Larkspur, but these can be prevented by regularly watering the plant, ensuring proper air circulation, and quickly removing any diseased leaves to prevent the spread of the disease.

Planting and maintenance tips

Ensure that you plant Candle Larkspur in an area with adequate space for the plant to grow freely with its vertical habit. Keep the soil moist, not waterlogged, and mulch around the base of the plant to retain moisture and prevent weeds.

Remove dead flower spikes to promote re-blooming, and prune the plant back to the ground after the first killing frost in the fall. In conclusion, Candle Larkspur is an elegant perennial that can add a touch of class and beauty to any garden or landscape with its beautiful blue or pink flowers.

Proper cultivation, care, and maintenance of Candle Larkspur not only give you an attractive display of blooms but also attract beneficial pollinators to your garden. With the information provided in this article, you can successfully grow Candle Larkspur in your garden and enjoy the beauty of its gorgeous flowers for years to come.

3) Plant propagation methods, including sexual and asexual reproduction

Candle Larkspur is a beautiful and sought-after perennial flower that can be propagated through various methods. Propagation refers to the process of reproducing plants through sexual or asexual means.

In the case of Candle Larkspur, both methods can be used to produce more plants. When it comes to sexual propagation, Candle Larkspur can be propagated through seed germination.

To begin, collect seeds from your existing Candle Larkspur plants and dry them in a warm and well-ventilated area. Once the seeds are dry, sow them in a seed tray filled with well-draining soil and place them in a location with bright, indirect light.

Water the tray regularly, and you should see the seeds begin to germinate in about two weeks. Once the seedlings have developed true leaves, transplant them into their permanent location.

Asexual propagation is another way of reproducing Candle Larkspur plants. This method is advantageous because it yields plants that are genetically identical to the parent plant, ensuring that the desirable traits of the parent plant are maintained.

There are different asexual propagation techniques, including cuttings and division. Cuttings involve taking a stem cutting from an existing Candle Larkspur and rooting it to create a new plant.

The cutting should be taken from a healthy and mature plant, and it should be about 4-6 inches long. Remove the lower leaves, dip the cut end in rooting hormone powder, and plant it in a growing medium that drains well.

Mist the cutting regularly to keep it hydrated, and in a few weeks, you should see roots beginning to form. Once the roots are well established, the cutting can be transplanted.

Division involves separating a mature plant into smaller clumps, each of which can grow into a mature plant. To begin, dig up the plant and separate the clumps into sections using a spade or knife.

Each section should have roots and shoots. It is best to do this process in the early spring or fall when the plant is not flowering.

Plant each division in a new location, and take care to water them regularly until they become established.

4) Plant adaptations to different environments

Candle Larkspur is native to central and western Europe, and it has evolved to adapt to different environments. The plant can grow in various settings, including meadows, open forests, and even in rocky areas.

Candle Larkspur is a versatile plant and can grow in both acidic and alkaline soils that are well-drained. Its adaptability allows it to survive and thrive even in challenging conditions.

Candle Larkspur has developed adaptations to help it survive in different environments. For example, the plant’s deep, narrow roots allow it to absorb water and nutrients from the soil efficiently.

This feature enables the plant to withstand drought conditions, making it a useful addition to water-wise gardens. Another adaptation of Candle Larkspur is its tolerance to cold temperatures.

The plant can tolerate temperatures as low as -30F, making it an excellent choice for gardens in areas with harsh winters. Candle Larkspur has also developed robust defenses against predators, including herbivores and pathogens.

The plant contains alkaloids, which provide natural resistance against insects and other herbivores. Additionally, the plant secretes chemicals that deter some fungi and bacteria, helping it fight off diseases that other plants may be susceptible to.

In conclusion, Candle Larkspur is a beautiful and versatile plant that can be propagated through both sexual and asexual means. The plant has developed adaptations that allow it to thrive in various environments, including areas with poor soil quality and harsh weather conditions.

By understanding propagation and adaptation, gardeners can help ensure the longevity and continued growth of Candle Larkspur plants in their gardens, contributing to the beauty and health of their surrounding ecosystems.

5) Usage of the plant in indoor setting

Candle Larkspur can add a touch of elegance and class to any indoor setting, provided that it is placed in a well-lit area. This is because the plant requires a significant amount of light to grow and bloom successfully.

As such, it is best to place the plant near a bright and sunny window, where it can receive at least six hours of direct or indirect light daily. Candle Larkspur can be grown in pots indoors, and it is ideal for those who wish to enjoy its beauty without having to deal with pests and diseases that may affect the plant outdoors.

To grow Candle Larkspur indoors, start by selecting a medium-sized pot with well-draining soil. The pot should be filled with soil that is rich in nutrients, and should have plenty of perlite or sand to enhance drainage.

Once the soil is prepared, plant the Candle Larkspur and ensure that it is anchored well in the soil. Water the plant regularly and ensure that it has adequate room to grow.

It is also advisable to use a slow-release fertilizer, such as a 10-10-10 fertilizer, which will help the plant thrive. Growing Candle Larkspur indoors can be challenging, primarily if you live in an area with low humidity and dry air.

However, you can increase humidity levels by placing a tray of water next to the plant or using a humidifier. You can also mist the plant foliage from time to time to hydrate it and reduce the risk of spider mites and other pests.

6) Usage of the plant in an outdoor setting

Candle Larkspur is a popular choice for outdoor landscapes, and it is easy to see why. The plant can grow tall, making it an ideal candidate for the back of flower beds or as a vertical accent in a garden design.

Candle Larkspur is also suitable for mixed borders and cottage gardens, where it can add a pop of color and texture to the landscape. To plant Candle Larkspur in an outdoor setting, begin by selecting an area that receives full to partial sun.

The plant prefers well-draining soils, so ensure that the soil is prepared correctly with a good mix of amendments to create an ideal environment for the plant. This can include adding organic matter to improve drainage and increase soil fertility.

Once the soil is prepared, plant the Candle Larkspur in the pre-dug holes, ensuring that it is placed at the same depth as it was in the container. The plant should be spaced at least one to two feet apart to allow for enough room to grow.

Candle Larkspur requires regular watering to keep the soil moist, but not waterlogged. It is advisable to water the plant early in the day to prevent the foliage from staying damp at night, which can cause fungal diseases.

Mulching around the base of the plant can help retain moisture and prevent weed growth. In terms of maintenance, Candle Larkspur needs to be pruned regularly to promote growth and reblooming.

Deadheading spent flowers can also encourage the plant to produce more blooms, prolonging the plant’s blooming period. A slow-release fertilizer can also help the plant maintain its vigor, especially during its growing period.

Candle Larkspur is relatively easy to care for, making it an excellent choice for both novice and experienced gardeners. Its beautiful blooms and upright habit make it an exciting addition to any outdoor landscape, contributing to the aesthetics and health of the surrounding ecosystem.

7) Toxicity of the plant to pets and horses, humans

While Candle Larkspur is a beautiful and relatively easy plant to care for, it is essential for pet owners and individuals to take note that it can be toxic to pets and horses. This is because Candle Larkspur contains alkaloids that can have toxic effects when ingested.

Ingestion of the plant can cause symptoms such as vomiting, diarrhea, increased heart rate, difficulty in breathing, and even death, particularly in horses. These symptoms can quickly progress and lead to severe medical complications, which is why it is crucial for pet and horse owners to be vigilant about the presence of Candle Larkspur in their surroundings.

To avoid potential toxicity, it is best to keep pets and horses away from Candle Larkspur plants as much as possible. This includes not planting the flower in areas where pets and horses commonly graze or play, and carefully monitoring outdoor activities to ensure that pets and horses are not accessing areas where the plant grows naturally.

Furthermore, individuals who handle Candle Larkspur should exercise caution when touching the plant, as the alkaloids can cause skin irritation or an allergic reaction. It is advisable to wear gloves when handling Candle Larkspur, and if exposure occurs, wash the skin thoroughly with mild soap and warm water.

In conclusion, Candle Larkspur is a beautiful and versatile plant that provides numerous benefits in outdoor and indoor settings. However, it is crucial to be aware of the toxic potential of the plant to pets, horses, and humans and take necessary precautions to avoid exposure.

Adopting safe practices in the handling and use of Candle Larkspur can help ensure its beauty remains a source of joy and safety for everyone. In conclusion, Candle Larkspur is a beautiful and versatile plant that can add an elegant touch to any indoor or outdoor setting.

It is easy to care for and can be propagated through various means, but it’s important to note its toxicity to pets, horses, and humans to avoid exposure. By understanding Candle Larkspur’s characteristics, cultivation, maintenance, and potential toxicity, readers can cultivate the plant successfully and enjoy its beauty safely.


Q: Is Candle Larkspur a perennial or an annual plant? A: Candle Larkspur is a perennial plant that can bloom year after year.

Q: What are the most common pest and disease issues that impact Candle Larkspur? A: The most common pest issues with Candle Larkspur are aphids and snails, while powdery mildew and botrytis are the most common disease issues.

Q: Can Candle Larkspur grow in alkaline soils? A: Yes, Candle Larkspur can grow in both acidic and alkaline soils, as long as the soil is well-draining.

Q: How often should I fertilize my Candle Larkspur plant? A: A slow-release fertilizer, like a 10-10-10 fertilizer, should be applied once or twice a year during the growing season.

Q: Can Candle Larkspur grow indoors? A: Yes, Candle Larkspur can grow indoors but requires adequate sunlight and humidity to thrive.

Q: How far apart should I plant Candle Larkspur in an outdoor setting? A: Candle Larkspur plants should be spaced at least one to two feet apart to allow for adequate room for growth.

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