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Delphinium vs. Larkspur: Are They the Same? 5 Key Differences and Which to Plant 
Have you ever bought flower seeds expecting tall, dramatic blue flower spikes, only to end up with a completely different-looking plant?
That can happen when you shop for delphiniums and larkspur. Their names are often used interchangeably, and seed listings do not always make the distinction clear. Although these plants are closely related, the annual larkspur commonly sold for gardens can look very different from the tall perennial delphiniums used in traditional cottage gardens.
The good news is that you can usually tell them apart by looking at their leaves, growth habits, and life cycles.
Delphinium vs. larkspur: What's the difference?
Garden delphiniums are generally short-lived perennials that can return for several years under suitable growing conditions. Annual larkspur, commonly sold under the botanical name Consolida ajacis or related names, grows, flowers, produces seeds, and dies within one growing season. Delphiniums typically have broad, deeply divided leaves and dense flower spikes, while annual larkspur has finely divided, feathery foliage and a more delicate appearance.
Both belong to the buttercup family, Ranunculaceae, and both can be poisonous if eaten.
If you want tall, dramatic flower spikes, delphinium may be the better choice. If you prefer an airy display that can reseed itself, annual larkspur may suit your garden better.
Let's compare the five main differences so you can choose the right plant.
Are Delphinium and Larkspur in the Same Family?
Yes. Delphiniums and annual larkspurs belong to the Ranunculaceae, commonly known as the buttercup family.
Their botanical classification can be confusing because the common name larkspur is used for certain plants in the genus Delphinium as well as annual garden larkspurs traditionally classified in the genus Consolida. Botanical classifications have also changed over time as researchers have studied relationships within this group.
This means the name on a seed packet matters. A product labelled simply "larkspur" may not be the tall perennial delphinium you imagined.
The two plants share some characteristics, including their distinctive flowers and toxicity, but their growth habits can be quite different.
Delphinium vs. Larkspur: Quick Comparison Table
Use this table to compare the plants before buying seeds or seedlings.
| Feature | Garden Delphinium | Annual Garden Larkspur |
|---|---|---|
| Common botanical name | Delphinium species and hybrids | Commonly Consolida ajacis and related garden forms |
| Life cycle | Perennial; lifespan varies by variety and climate | Annual; completes its life cycle in one growing season |
| Height | Often 2–6 feet; some varieties grow taller | Often 1–4 feet, depending on variety and growing conditions |
| Leaves | Broad, deeply divided, palm-shaped foliage | Fine, narrow, feathery foliage |
| Flower spikes | Usually dense and upright | Often more open, delicate, and branched |
| Flower colours | Blue, purple, pink, white, and other cultivar-dependent colours | Blue, pink, purple, and white, depending on the variety |
| Typical flowering season | Often late spring to summer in suitable climates | Often spring to early summer, depending on sowing time and climate |
| Returns the following year? | May regrow from the same plant if it survives | The original plant dies, but dropped seeds may produce new plants |
| Self-seeding | Possible for some plants | Common in suitable conditions if seed heads are allowed to mature |
| Maintenance | Tall varieties often need staking and careful watering | Generally simpler to grow, although tall varieties may need support |
| Climate preference | Generally performs best where summers are cool or moderate | Often suited to cool-season growing, with timing depending on climate |
| Toxicity | Poisonous if ingested | Poisonous if ingested |
Important: Height, flowering time, hardiness, and lifespan vary by species, cultivar, and growing conditions. Always check the botanical name and growing instructions on the seed packet rather than relying on the common name alone.
Difference 1: Life Cycle — Perennial Delphinium vs. Annual Larkspur
This is the most important difference because it determines whether you should expect the same plant to return next year.
Delphinium: A Perennial That Can Return
Most garden delphiniums are grown as perennials. If the plant survives winter and its growing conditions remain suitable, it can produce fresh growth from its crown the following spring.
However, perennial does not mean permanent.
Some delphiniums live for several years, while others decline sooner because of summer heat, excessive moisture, crown rot, poor drainage, or other growing problems. Their lifespan is not the same everywhere.
In cooler climates, certain varieties may return for several seasons. In regions with hot, humid summers, maintaining them can be more difficult.
To help your delphiniums survive:
Plant them in soil that drains well.
Give them sufficient sunlight without exposing heat-sensitive varieties to excessive heat.
Water deeply when needed, but avoid keeping the crown constantly wet.
Support tall flower stalks before they become heavy.
Remove spent flower stalks when appropriate and clean up dead foliage.
Monitor the crown for signs of rot or disease.
Some established plants may produce another flush of flowers after the first flowering period if the spent stalks are removed. This depends on the variety and growing conditions, so a second bloom is not guaranteed.
Annual Larkspur: One Growing Season, Then Seeds
Annual garden larkspur follows a different life cycle.
It grows from seed, develops foliage, produces flowers, forms seed pods, and then dies. The original plant does not normally return from the same perennial crown the following year.
However, it may appear again if mature seeds fall onto suitable soil.
This is called self-seeding. New seedlings grow from those seeds, giving the impression that the original plant survived winter.
For a natural-looking garden, this can be an advantage. Once established, a self-seeding patch may produce fresh plants in later seasons without requiring you to sow every seed by hand.
If you want to prevent unwanted seedlings, remove the flower stalks before the seeds mature.
Remember: A returning delphinium is usually new growth from an existing perennial plant. A returning patch of annual larkspur may consist of new plants grown from seed.
Difference 2: Flower Spikes — Tall, Dense Towers vs. Airy Flowers
The flower spikes are another useful way to distinguish these plants.
Delphinium: A Dramatic Vertical Display
Many popular delphiniums produce tall, upright spikes covered with numerous flowers. Depending on the variety, the flowers may be single, semi-double, or double.
Their strong vertical shape makes them popular in cottage gardens, mixed borders, and the back of flower beds.
Some tall varieties can reach several feet in height, creating a striking display behind shorter flowers. Their flowers may appear in shades of blue, purple, pink, and white.
Popular groups include:
Elatum hybrids: Often grown for tall, impressive flower spikes.
Pacific Giant hybrids: Traditional tall garden forms available in several colours.
New Zealand hybrids: A range of garden varieties selected for flower quality and appearance.
Belladonna types: Often more open and branching than many tall elatum hybrids.
Grandiflorum types: Generally shorter and more compact, although characteristics vary among cultivars.
Tall delphiniums can be beautiful, but their flower stalks may bend or break in strong wind or heavy rain. Staking is often necessary.
Annual Larkspur: A More Delicate Appearance
Annual larkspur generally has a lighter, more delicate appearance. Its flower stalks may be branched, with flowers arranged more loosely than those of many tall delphinium cultivars.
This makes it useful in informal flower beds, meadow-style plantings, and cutting gardens.
Depending on the variety, annual larkspur can grow taller than some compact delphiniums. Therefore, height alone is not a reliable way to identify the plant.
Look at the overall shape of the flower stalks as well as the leaves.
Which should you choose?
Choose a tall delphinium if you want a bold vertical accent in a cottage garden. Choose annual larkspur if you prefer a lighter, more natural-looking display that can blend into a mixed flower bed.
Difference 3: Leaves — The Easiest Way to Identify Them
If the plants are not flowering yet, their foliage can help you distinguish them.
Delphinium Leaves: Broad and Deeply Divided
Delphinium leaves are generally broad and deeply divided into several sections. They often look palm-shaped, with divisions spreading outward from a central point.
The foliage is usually more substantial than the fine leaves of annual larkspur.
When shopping for seedlings, look for leaves with broad sections rather than thin, thread-like divisions.
Annual Larkspur Leaves: Fine and Feathery
Annual larkspur has finely divided foliage that resembles dill or other delicate, feathery herbs.
The narrow leaf divisions give the plant a lighter appearance, even before its flowers open.
This difference is particularly useful when buying young plants, although leaf shape can vary among species and seedlings.
A Simple Nursery Identification Tip
Broad, deeply divided, palm-shaped leaves suggest a delphinium.
Finely divided, feathery leaves suggest annual garden larkspur.
Do not rely on this clue alone if you are unsure about the plant. Check the botanical name on the label, especially when ordering seeds online.
A photograph of mature flowers may not show enough detail to confirm which plant you are buying.
Difference 4: Toxicity — Both Plants Require Careful Handling
Delphiniums and annual larkspurs are not edible garden flowers. Both groups contain toxic alkaloids, and ingestion can cause serious poisoning.
The exact toxicity depends on the species, plant part, growth stage, and amount eaten. It is not reliable to assign one universal level of danger to every plant sold under either common name.
Are Delphiniums Poisonous?
Yes. Delphiniums contain alkaloids that can affect the nervous system.
Depending on the plant and amount ingested, poisoning may cause symptoms such as:
Nausea and vomiting
Abdominal discomfort
Weakness or muscle problems
Abnormal heart function
Breathing difficulties
Severe neurological effects in serious cases
The risk is especially important around livestock, which may consume toxic plants while grazing. Certain larkspur species are major causes of livestock poisoning in some grazing regions.
Do not assume that a plant is safe simply because it is growing in an ornamental garden.
Is Annual Larkspur Poisonous?
Yes. Annual garden larkspur is also poisonous if eaten.
Keep seeds, seedlings, leaves, and flowers away from children and animals who might chew them. Seed packets should be stored in their original labelled packaging in a secure location.
What About Dogs, Cats, and Other Pets?
Do not allow pets to chew either plant.
If a pet eats delphinium or larkspur, contact a veterinarian promptly. If a person ingests part of the plant, seek advice from a local poison information service or medical professional. Do not wait for symptoms to appear if you suspect a significant ingestion.
Do not induce vomiting or try home remedies unless a qualified medical professional or veterinarian specifically instructs you to do so.
Wear gardening gloves if you prefer to avoid direct contact with potentially irritating plant material, and wash your hands after handling the plants.
Safety takeaway: Neither delphinium nor annual larkspur is a good choice for a garden where children or animals are likely to eat ornamental plants. If you grow them, label them clearly and keep them out of reach.
Difference 5: Deer Resistance and Maintenance
Gardeners often look for plants that deer and rabbits are less likely to eat. Delphiniums and larkspurs may be avoided by browsing animals, but neither should be considered completely deer-proof or rabbit-proof.
Animal behaviour changes with local food availability, weather, and individual feeding habits.
Are Delphiniums Deer-Resistant?
Delphiniums are often described as deer-resistant, but hungry deer may still browse them.
Their toxicity is an additional reason to prevent livestock and pets from eating them. Do not rely on poisonous plants as a substitute for proper fencing or other wildlife-management measures.
Are Annual Larkspurs Deer-Resistant?
Annual larkspur may also experience less browsing in some gardens, but results vary. If deer regularly visit your garden, observe what happens locally rather than assuming the plants will remain untouched.
Neither plant should be described as guaranteed protection against deer or rabbits.
Delphinium Care: More Attention Required
Tall delphiniums can require regular care, particularly when growing conditions are not ideal.
1. Provide well-drained soil.
Delphiniums generally prefer fertile soil that holds some moisture but does not remain waterlogged. Poor drainage can encourage root and crown problems.
2. Choose the location carefully.
Many garden delphiniums perform best in sunny positions with good air circulation. In hot climates, intense afternoon heat may stress varieties adapted to cooler summers.
3. Water consistently.
Water when the soil begins to dry, adjusting the frequency to the weather and soil type. Water near the base when possible, and avoid leaving the crown persistently wet.
4. Stake tall flower stalks.
Install supports before the flower spikes become heavy. Tie the stems loosely enough to avoid damaging them as they grow.
5. Feed according to the plant's needs.
Use a suitable garden fertiliser according to its label and the condition of the soil. Avoid excessive fertiliser, which can encourage weak growth or create other problems.
6. Remove spent flower stalks when appropriate.
Cutting back finished flower stalks can improve the plant's appearance and may encourage further flowering in some varieties. Remove dead or diseased material promptly.
7. Watch for pests and disease.
Poor airflow, wet foliage, and unsuitable growing conditions can contribute to disease problems. Inspect plants regularly and address issues early.
Annual Larkspur Care: Usually Simpler
Annual larkspur can be a practical choice if you want flowers without maintaining a perennial plant for several years.
For good results:
Sow seeds according to the variety's instructions and your local climate.
Choose a site with suitable sunlight and well-drained soil.
Keep the soil reasonably moist while seedlings establish.
Thin overcrowded seedlings to improve airflow.
Allow some seed heads to mature if you want the plants to self-seed.
Remove seed heads before maturity if you do not want seedlings appearing in later seasons.
Some annual larkspur varieties can become tall and may need support in exposed locations. Do not assume that every variety will remain upright without staking.
Which Should You Plant? Choose According to Your Garden
The best choice depends on your climate, the appearance you want, and how much maintenance you can provide.
Choose Delphinium If:
You want tall, dramatic flower spikes.
You prefer a perennial plant that may return in future seasons.
You have suitable soil and can provide regular care.
Your summers are cool or moderate enough for the variety you choose.
You can protect tall flower stalks from strong winds and heavy rain.
For a traditional cottage-garden display, look at suitable elatum or Pacific Giant hybrids. For a shorter plant, consider compact grandiflorum types or other varieties specifically sold for smaller spaces.
Always check the mature height and climate recommendations for the individual cultivar.
Choose Annual Larkspur If:
You prefer delicate, feathery foliage.
You want a flower that completes its life cycle in one growing season.
You like the idea of plants self-seeding in suitable conditions.
You want to create a natural-looking flower bed or informal meadow-style display.
You prefer not to maintain the same perennial plant for several years.
Annual larkspur can also be useful in cutting gardens. Harvest flowers when a suitable portion of the flower spike has opened, use a clean cutting tool, and place the stems in clean water. Remove foliage that would sit below the waterline, and keep the arrangement away from excessive heat and direct sunlight.
Can You Grow Both Together?
Yes, provided the growing conditions suit both plants.
A combination can create variation in height, foliage, and flower shape. Tall delphiniums can provide a vertical accent at the back of a border, while annual larkspur can fill spaces around them.
However, flowering periods overlap differently depending on your climate and sowing dates. Do not assume that both plants will flower continuously from spring through midsummer.
Give each plant enough space for air circulation and access to sunlight. Keep in mind that both are poisonous if eaten when deciding where to plant them.
Can You Grow Delphinium and Larkspur in Containers?
Yes, but the best container choice depends on the variety.
Growing Delphinium in Pots
Compact delphiniums are generally easier to manage in containers than very tall varieties.
Choose a pot with drainage holes and enough room for the plant's root system. Use a suitable potting mix that retains some moisture while draining freely.
Keep the container from drying out completely, particularly during warm weather. At the same time, never leave the roots sitting in stagnant water.
Tall varieties may need staking, and their containers can become top-heavy in windy conditions. A sheltered position can help reduce damage.
In warm climates, container-grown delphiniums may experience additional heat stress because the potting mix warms more quickly than garden soil. Choose a variety suited to your local conditions.
Growing Annual Larkspur in Pots
Annual larkspur can also grow in containers.
Use a pot with good drainage, sow the seeds according to the packet instructions, and thin seedlings if they become crowded. The final plant height depends on the variety, available light, and growing conditions.
Even though some varieties have a relatively light growth habit, tall stems may still need support in exposed positions.
Remember that annual larkspur dies after completing its life cycle. Save or allow some seeds to mature if you want to grow another crop.
Frequently Asked Questions
1. Are delphinium and larkspur the same plant?
Not always. The common name larkspur is used for some Delphinium species and for annual garden larkspurs commonly classified as Consolida. Check the botanical name to identify the plant accurately.
2. Does delphinium come back every year?
Many garden delphiniums are perennials and may return each year if the plant survives winter and its growing conditions remain suitable. Their lifespan varies by variety and climate.
3. Does annual larkspur come back next year?
The original annual plant normally dies after flowering and producing seeds. New plants may grow the following year if seeds fall onto suitable soil and germinate.
4. How can I tell delphinium from annual larkspur without flowers?
Look at the foliage. Delphiniums generally have broader, deeply divided leaves, while annual larkspur usually has fine, feathery leaves. Confirm the identification using the plant label or botanical name.
5. Which plant grows taller?
Many garden delphiniums grow taller than annual larkspur, particularly the tall elatum and Pacific Giant types. However, the exact height varies, and some annual larkspur varieties can also become tall.
6. Are delphinium and larkspur safe for pets?
No. Both can be poisonous if ingested. Keep pets away from the plants, and contact a veterinarian promptly if you suspect that an animal has eaten any part of either plant.
7. Which is easier for beginners?
Annual larkspur may be easier if you want a plant that grows, flowers, and produces seeds in one season. Delphiniums can require more attention, especially when tall varieties need staking or the local climate is too hot or humid.
8. Can I save seeds from both plants?
Yes, if the plants produce mature seeds and you can collect them safely. However, seedlings from hybrid delphiniums may not have the same flower colour or characteristics as the parent plant. Label stored seeds clearly and keep them away from children and pets because they may be poisonous.
Final Verdict: Which One Is Right for You?
Delphinium and annual larkspur are related plants, but they offer different gardening experiences.
Choose delphinium if you want impressive flower spikes and are prepared to provide the conditions and care the variety needs.
Choose annual larkspur if you prefer feathery foliage, a lighter floral display, and the possibility of self-seeding for future seasons.
Want both? Grow them together if your climate and garden layout suit them, and give each plant enough room to thrive.
Before buying seeds online, check the botanical name, mature height, life cycle, and growing requirements. The product photograph alone may not tell you which plant you are purchasing.
That small check can save you money, time, and a disappointing growing season.
Next read: Can You Plant Delphinium Seeds in Fall? A Guide to Sowing Time and Seed Germination.
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