Larkspur
Quick Overview
Common Name: Larkspur, Annual Delphinium
Scientific Name: Consolida ajacis, Consolida orientalis
Plant Type: Annual
USDA Zones: 2 to 11
Sun Requirement: Full Sun to Partial Shade
Soil Type: Well-drained, average to moderately fertile
Bloom Season: Late Spring through Early Summer
Height: 24 to 48 inches depending on variety
Pollinator Friendly: Yes
Edible: No, toxic if ingested
Why Grow Larkspur on a Homestead
Larkspur is one of the most romantic and commercially compelling cool season cut flowers available to homestead growers. Its tall, densely packed spikes of delicate florets in the most extraordinary range of blues, purples, lavenders, pinks, salmon, white, and deep magenta create a vertical element in spring and early summer arrangements that florists consistently seek and that is genuinely difficult to replicate with any other cool season flower. At farmers markets during its brief and brilliant blooming season, Larkspur stops customers in their tracks with the kind of old-fashioned garden beauty that resonates powerfully with anyone who remembers these flowers from a grandmother's garden or a cottage cutting garden from their past.
For homestead growers, Larkspur represents one of the most rewarding and economical cool season annuals available. It direct sows readily in cool soil, requires virtually no ongoing care after germination, produces an abundance of long-stemmed spikes over its generous cool season blooming period, and self-seeds prolifically so that after the first year it often returns without any additional seed investment. Its dried flower performance is exceptional as well, with the colorful spikes drying beautifully and retaining much of their color for use in wreaths, dried arrangements, and botanical products that provide income well beyond the fresh flower season.
Here is why Larkspur deserves a prominent spot on your homestead:
It provides tall, dramatic vertical spikes in a color range that almost no other cool season flower can match. The blues, purples, and lavenders of Larkspur are among the most sought-after cool season cut flower colors and are available from very few other spring crops. This color rarity creates genuine market differentiation and supports premium pricing.
It is extraordinarily economical to produce. Larkspur seeds are inexpensive, the plant needs no fertilizing, no pest management, and no trellising or support. It is one of the highest-return cool season crops per dollar invested in seed and time.
It self-seeds prolifically after the first year. Larkspur is a generous self-seeder that returns year after year in a managed cutting garden without additional seed investment. Once established it becomes a self-renewing resource that requires only minimal management to maintain.
It dries beautifully for year-round income. Dried Larkspur spikes retain much of their extraordinary color range when properly dried, creating premium dried flower products that sell consistently throughout the year at craft markets, online shops, and through florists.
It is in consistent demand from wedding florists. Larkspur is a staple in romantic, garden-style, and cottage-aesthetic wedding designs. Its tall spikes, extraordinary color range, and delicate floret texture make it one of the most versatile and sought-after cool season wedding flowers.
Growing Conditions
Sunlight
Larkspur performs best in full sun but tolerates partial shade reasonably well. It needs at least 4 to 6 hours of direct sunlight per day for the strongest stems and most abundant flowering. In deeper shade stems become weak and elongated and the densely packed spikes that make Larkspur so valuable as a cut flower become less impressive. For cut flower production with the longest, strongest stems full sun is always the preferred choice.
Soil
Larkspur prefers well-drained, average to moderately fertile soil. It performs well in average garden soil amended with a modest amount of compost but does not need heavily amended or richly fertile beds. Good drainage is important as Larkspur does not tolerate waterlogged conditions. Overly rich soil can produce lush foliage at the expense of the tall, strong flower spikes most valuable for cut flower use. Soil pH between 6.0 and 7.0 is ideal.
Water
Water consistently throughout the growing season to maintain even soil moisture. Larkspur needs regular moisture during active growth and blooming but does not tolerate waterlogged conditions. Water deeply at the base of plants rather than overhead to reduce the risk of fungal diseases on the delicate foliage. Once established, Larkspur is moderately drought tolerant but produces the best stems and the longest blooming period with consistent moisture throughout the cool season.
Temperature
Larkspur is a cool season annual that performs best in moderate temperatures between 45 and 65 degrees Fahrenheit. It tolerates light frost and actually germinates best in cool to cold soil. It declines rapidly when temperatures consistently exceed 75 to 80 degrees Fahrenheit, bolting and going to seed as summer heat arrives. In mild winter climates within USDA zones 8 to 11, Larkspur is best grown as a fall through spring crop, taking advantage of the cool growing season for an exceptionally long and productive blooming period. In cold winter climates within USDA zones 3 to 7, it is grown as an early spring annual sown as soon as the soil can be worked and harvested through early summer before heat causes bolting.
Planting Guide
Larkspur grows best from direct sowing. It has a delicate taproot that makes it difficult to transplant successfully and it establishes most readily when sown directly in the garden at the correct time. Larkspur seeds also require exposure to cold temperatures to germinate reliably, a characteristic that makes fall or very early spring sowing in cool soil essential for good germination rates.
Step 1: In cold winter climates within USDA zones 3 to 7, direct sow Larkspur seeds in very early spring, ideally while light frosts are still possible and soil temperatures are cool. Larkspur germinates best in soil temperatures between 50 and 60 degrees Fahrenheit. In mild winter climates within USDA zones 8 to 11, sow in fall for winter and spring blooming.
Step 2: Choose a location with full sun and well-drained soil with average to moderate fertility. Avoid heavily amended beds with excessive compost.
Step 3: Larkspur seeds need darkness to germinate, which is the opposite of many other cool season flowers. Sow seeds directly into the ground and cover with approximately one quarter inch of soil. Press firmly to ensure good seed to soil contact.
Step 4: Water gently after sowing and keep the soil surface lightly moist until germination, which typically occurs within 14 to 21 days in cool soil. In very cold conditions germination may be slower.
Step 5: Thin seedlings to 6 to 9 inches apart once they are a few inches tall. Proper thinning is important for cut flower production as crowded plants produce shorter, weaker stems.
Step 6: For a continuous harvest, succession sow every two to three weeks from very early spring through mid spring in cold winter climates. In mild winter climates, sowing in fall and again in late winter extends the overall harvest window significantly.
Seed vs Transplant: Direct sowing is strongly required. Larkspur does not transplant well due to its delicate taproot and germinates poorly in warm indoor conditions. Always sow directly outdoors in cool conditions.
Spacing: 6 to 9 inches apart for cut flower production.
Planting Season: Very early spring in cold winter climates within USDA zones 3 to 7. Fall through early winter in mild winter climates within USDA zones 8 to 11.
Maintenance
Thinning
Proper thinning is one of the most important steps for cut flower production. Overcrowded Larkspur plants produce shorter, weaker stems that are less valuable for market. Thin seedlings to 6 to 9 inches apart as soon as they are large enough to handle to ensure each plant has adequate space to develop the tall, strong stems that florists and customers want.
Staking
Tall Larkspur varieties in exposed locations may benefit from light support to prevent flopping in wind and rain. Install horizontal support netting or low brush stakes early in the season before stems reach their full height. In sheltered locations and with proper thinning, most Larkspur varieties produce stems strong enough to stand without support.
Deadheading and Seed Pod Management
For maximum fresh flower production, deadhead spent spikes promptly to encourage the development of lateral shoots that produce additional smaller spikes. For self-seeding and dried seed pod production, allow selected spikes to mature naturally and disperse seed at the end of the season. Larkspur self-seeds generously and even a small proportion of plants allowed to set seed will provide an abundance of volunteer seedlings the following season.
Fertilizing
Larkspur does not need heavy feeding. A light application of balanced fertilizer at planting is sufficient for average soil. Avoid excessive nitrogen which promotes lush foliage at the expense of flower spike production.
Pest Control
Larkspur is generally pest resistant in cool conditions. Aphids can occasionally appear on stems and developing spikes but are usually managed naturally by beneficial insects. Slugs and snails can damage emerging seedlings in wet conditions. Iron phosphate slug bait provides effective control if needed.
Harvesting
When to Harvest
Harvest Larkspur spikes when approximately one quarter to one third of the florets on the spike are open, starting from the bottom of the spike upward. The remaining florets will continue to open progressively after cutting, giving the stem a long and evolving display in the vase. Spikes harvested when too few florets are open may not continue to develop fully after cutting. Spikes harvested when already mostly open have a shorter remaining vase life. Harvest in the early morning when stems are fully hydrated and temperatures are at their coolest.
How to Cut
Use clean, sharp scissors or pruners. Cut stems as long as possible, ideally 18 to 30 inches for tall varieties. Cut just above a set of leaves or a lateral shoot to encourage new spike production from branches below the cut. Remove all foliage from the lower half of the stem immediately after cutting. Place stems immediately into a bucket of cool water with a floral preservative. Note that all parts of the Larkspur plant are toxic if ingested. Always wash hands after handling cut stems.
Conditioning
After cutting, place stems in deep cool water in a cool, dark location for several hours or overnight before sale or arrangement. This conditioning period allows stems to fully hydrate and significantly improves vase life. Properly conditioned Larkspur holds up well in arrangements and at market displays throughout its blooming season.
Drying
Larkspur is an excellent dried flower with outstanding color retention compared to most other dried flowers. To dry Larkspur, gather stems into small loose bundles and hang upside down in a warm, dry, well-ventilated space away from direct sunlight. Drying takes approximately two to three weeks. The colorful spikes retain much of their extraordinary color range when dried and create beautiful material for dried wreaths, arrangements, and botanical products. Harvest for drying when approximately one third of florets are open for the best color and form after drying.
How Often to Harvest
During peak bloom, harvest every two to three days as new spikes reach the correct stage. After the main central spike is harvested, lateral shoots develop and produce secondary spikes that are somewhat smaller but still harvestable and marketable. Regular harvesting extends the productive life of each plant throughout the cool season.
Vase Life
Larkspur typically lasts 7 to 10 days as a fresh cut flower with proper conditioning and care. Strip all foliage below the waterline, recut stems at an angle, and place in fresh water with a floral preservative. Change water every few days and keep arrangements cool to maximize vase life.
Uses on a Homestead
Cut Flower Use
Larkspur is primarily grown as a fresh cut flower. Its tall, densely packed spikes add dramatic vertical structure, extraordinary color, and a romantic, old-fashioned garden quality to spring and early summer bouquets and arrangements. It pairs beautifully with peonies, roses, sweet peas, ranunculus, and other romantic spring flowers in arrangements that capture the essence of the spring garden at its most lush and beautiful. It also pairs naturally with other cool season flowers including stock, snapdragons, and nigella in mixed spring bouquets.
Dried Flower Use
Dried Larkspur is one of the most commercially valuable dried flower products available from a cool season annual. Its spikes retain much of their extraordinary color range when dried, creating premium products that are in consistent demand from florists, crafters, and wreath makers throughout the year. Dried Larkspur bundles in the distinctive blues, purples, and pinks of the best varieties are among the most sought-after dried flower products at craft markets and online shops.
Wedding and Event Flowers
Larkspur is a staple in romantic, garden-style, and cottage-aesthetic wedding designs. Its tall spikes, extraordinary color range, and delicate floret texture make it one of the most versatile and sought-after cool season wedding flowers. Wedding florists working in romantic and garden styles actively seek out local sources of quality Larkspur stems during its brief spring season.
Pollinator Support
Larkspur attracts bumblebees and other long-tongued pollinators that are specially adapted to access the nectar in its distinctive spurred flowers. It provides a valuable cool season nectar source at a time when many summer pollinators are just beginning to build their colonies.
Can You Make Money With Larkspur
Yes, Larkspur is a profitable specialty cut flower and dried flower crop for homestead operations, particularly for growers who leverage its extraordinary color range, dual fresh and dried market capability, and near-zero ongoing input costs.
Rare cool season color commands premium pricing. The blues, purples, and lavenders of Larkspur are among the most sought-after cool season cut flower colors and are available from very few other spring crops. This genuine color rarity creates market differentiation that justifies premium pricing.
Dual fresh and dried market. The same stems that sell as premium fresh cut flowers can be dried and sold as premium dried products, maximizing revenue from every stem produced and providing year-round income from a single seasonal harvest.
Self-seeding habit reduces ongoing seed costs. After the first season, Larkspur self-seeds generously in a managed cutting garden, providing an essentially free renewal of the planting each year with minimal seed investment.
Near-zero ongoing input costs. Larkspur needs no fertilizing, minimal watering once established, and has virtually no pest or disease management requirements in appropriate growing conditions. The return on investment per seed packet is exceptional.
Farmers Market: Fresh Larkspur bundles sell for 8 to 14 dollars per bunch depending on color, stem length, and spike density. Single-color bundles of the most sought-after blue and purple varieties command the highest prices.
Florists and Wedding Designers: Larkspur is a consistently sought-after specialty vertical accent for florists and wedding designers working in romantic and garden-style aesthetics. Local supply during its brief cool season bloom is rare and valued.
Dried Flower Market: Dried Larkspur bundles and stems sell well at craft markets, holiday markets, and through online shops year round. Their extraordinary color retention and elegant spike form make them among the most commercially compelling dried flower products available.
CSA Flower Subscriptions: Larkspur adds dramatic vertical color and an old-fashioned garden romance to spring and early summer flower subscription boxes that subscribers find immediately beautiful and distinctive.
Companion Plants
Larkspur grows beautifully alongside other cool season flowers with similar growing requirements and complementary bloom times.
Peonies: Both bloom in late spring and early summer and complement each other magnificently in romantic mixed bouquets where Larkspur provides tall vertical spikes and peonies provide lush, opulent focal blooms.
Nigella: Both are delicate, self-seeding cool season annuals with similar growing requirements that complement each other beautifully in romantic mixed spring bouquets.
Sweet Peas: Both are fragrant cool season flowers that bloom at overlapping times and complement each other naturally in the spring cutting garden and in romantic mixed bouquets.
Ranunculus: Both are cool season flowers that bloom at overlapping times and pair magnificently in romantic spring arrangements where Larkspur provides vertical drama and ranunculus provides refined, layered focal interest.
Orlaya: Both are cool season annuals with delicate florets that complement each other beautifully in romantic mixed spring bouquets and share similar lean-soil growing preferences.
Poppies: Both are delicate, self-seeding cool season flowers that complement each other beautifully in loose, romantic spring and early summer arrangements.
Common Problems
Poor Germination
The most common challenge with Larkspur. Seeds germinate poorly in warm soil, in overly dark conditions if covered too deeply, or if planted too late in the season when soil has warmed. Always sow in cool conditions when soil temperatures are between 50 and 60 degrees Fahrenheit. Cover seeds with approximately one quarter inch of soil as they need darkness to germinate but do not bury deeply. In mild winter climates, fall sowing provides the natural cool temperatures that Larkspur needs for reliable germination.
Bolting in Heat
Larkspur bolts and declines rapidly when temperatures rise above 75 to 80 degrees Fahrenheit. There is no way to prevent bolting once summer heat arrives. Plan for plants to decline as temperatures rise and use this natural transition as the signal to harvest remaining spikes for drying before the season ends. Regular deadheading and consistent moisture extend the productive cool season period as long as possible.
Floppy Stems
Can occur in overly rich soil, insufficient sun, or overcrowded conditions. Grow in average soil with full sun and thin properly to the correct spacing of 6 to 9 inches. Avoid high nitrogen fertilizers. Horizontal support netting can help in exposed locations.
Aphids
Occasionally appear on stems and developing spikes. Usually managed naturally by beneficial insects in cool conditions. A strong spray of water or neem oil can be used if populations become problematic.
Failure to Self-Seed
Can occur when all seed heads are harvested or deadheaded before seeds mature and disperse, or in very hot, dry summers that prevent seed germination. Allow a small proportion of plants in a designated area to set seed and disperse naturally each season. Lightly raking the soil in that area in fall in mild winter climates or in very early spring in cold winter climates helps work seeds into contact with the soil for better germination.
Varieties to Consider
Giant Imperial Series: The most widely grown Larkspur series for cut flower production. Tall, uniform plants reaching 36 to 48 inches with very densely packed flower spikes in a wide range of colors including deep blue, soft blue, white, pink, salmon, lavender, purple, and carmine. Strong stems and excellent cut flower performance. Available in individual colors and mixed collections. The standard for professional cut flower production.
Giant Imperial Blue Cloud: A soft, powdery blue individual color from the Giant Imperial series. One of the most sought-after Larkspur colors in the cut flower market. Commands premium prices for its distinctive soft blue tone that is genuinely rare in the cool season cut flower palette.
Giant Imperial White King: Pure white spikes on tall, strong stems. Very popular with wedding florists for its clean white color and classic elegant form. Excellent for mixed bouquets and wedding work.
Giant Imperial Carmine King: Deep carmine-red spikes on strong stems. Very popular with florists working with warm, rich color palettes. One of the most dramatic and commercially striking individual colors in the Giant Imperial range.
Sublime Series: A series specifically developed for commercial cut flower production with uniform stem length, excellent spike density, and strong performance across a wide range of growing conditions. Available in individual colors and mixtures.
Misty Lavender: A soft lavender-blue variety with a romantic, hazy quality that is very popular with wedding florists. Commands premium prices for its unusual and sophisticated soft color.
Frosted Skies: A bicolor variety with white petals edged in soft blue. Very popular with florists and customers for its distinctive two-toned appearance that adds visual interest and refinement to mixed spring bouquets.
Final Thoughts
Larkspur is one of the most beautiful, most ecologically generous, and most commercially rewarding cool season annuals a homestead flower grower can cultivate. Its extraordinary color range, dramatic vertical spikes, self-seeding generosity, and dual fresh and dried market capability combine to create a crop that delivers exceptional commercial value from one of the lowest per-square-foot investments in seed and time available in the entire cut flower world. It asks only for cool conditions at sowing, average to lean well-drained soil, and the understanding that its brief and brilliant season must be harvested diligently before summer heat brings it to its natural end. Give it those things and Larkspur will fill your spring cutting garden, your market stand, and your dried flower inventory with some of the most beautiful and genuinely sought-after stems available to any homestead cut flower grower.
FAQ
Why won't my Larkspur germinate? Larkspur germination failure is almost always caused by soil that is too warm, seeds planted too shallowly or too deeply, or sowing too late in the season. Larkspur germinates best in cool soil between 50 and 60 degrees Fahrenheit and needs to be covered with approximately one quarter inch of soil as it requires darkness to germinate. Seeds sown in warm summer or late spring soil typically fail to germinate regardless of other conditions. In cold winter climates, sowing as early as possible in spring while soil is still cool is essential. In mild winter climates, fall sowing when soil temperatures drop into the ideal range gives the best germination results.
Is Larkspur the same as Delphinium? Larkspur and Delphinium are closely related but distinct plants. Both belong to the Ranunculaceae family and produce similar tall, densely packed flower spikes in overlapping color ranges. Larkspur, genus Consolida, is an annual that completes its entire life cycle in a single growing season. Delphinium is a perennial that returns year after year from established root systems. Annual Larkspur is generally easier to grow, germinates readily from direct-sown seed, and self-seeds prolifically. Perennial Delphinium produces taller, more substantial spikes but requires more intensive cultivation and is significantly more demanding to grow successfully for cut flower production.
Can Larkspur be toxic? Yes, all parts of the Larkspur plant are toxic if ingested, particularly the seeds and young plant tissue. The plant contains alkaloids that can cause severe illness in humans and livestock. Always wash hands thoroughly after handling Larkspur stems and keep the plant away from areas where children or livestock might access it. For cut flower use the plants are safe to handle with normal precautions and the cut stems pose no contact hazard. Always inform customers of the plant's toxicity if relevant to their situation.
How do I get the most vivid color in dried Larkspur? Harvest stems for drying when approximately one third of the florets on the spike are open, before the flowers are fully developed. Stems harvested at this stage dry with the most vivid and saturated color. Bundle loosely in groups of ten to fifteen stems and hang upside down in a warm, dry, well-ventilated space away from all direct light. Light bleaches the extraordinary blue and purple colors very rapidly. Keep drying bundles in the darkest available drying space for the best color retention. Properly dried and stored Larkspur retains its color for one to two years.
How do I encourage Larkspur to self-seed reliably? Allow a small proportion of plants in a designated area to complete their natural life cycle without harvesting or deadheading. Let the seed pods mature fully and begin to split and release seed naturally. In cold winter climates, lightly rake the soil surface in early spring to work seeds into contact with the soil. In mild winter climates, a light soil disturbance in early fall after seeds have dispersed encourages germination of the fall-sown seedlings that will bloom the following spring. Avoid deep cultivation in areas where you want Larkspur to self-seed as this buries seeds too deeply for reliable germination.