How to Winter Sow Larkspur Seeds for a Stunning Cottage Garden

Learn how to winter sow larkspur seeds with tips from a Master Gardener. Grow stronger, healthier blooms the easy way.

Larkspur, with its tall spires of jewel-toned blooms, has always been a must-have in my Zone 6B cutting garden. I plant them every spring alongside snapdragons and love how they add instant height and elegance to my raised beds. As a long-time gardener who’s been starting seeds for nearly three decades, I’ve experimented with just about every method to grow these cool-season beauties—from traditional indoor seed starting to direct sowing outdoors.

In my early gardening years, I used to carefully start larkspur indoors under grow lights, tending each tiny seedling and worrying about hardening them off properly. (If you prefer the indoor route, you can read my full guide on how I start seeds indoors here: How to Start Seeds Indoors Without a Greenhouse

But after years of trial and error, I discovered a far simpler and far more successful way to grow larkspur: winter sowing. This method mimics their natural preference for cool temperatures and outdoor conditions, and in my Zone 6B garden it consistently gives me the strongest, most resilient seedlings with almost no effort. My germination rates improved dramatically once I switched, and I’ve been winter sowing them ever since.

If you’re new to winter sowing, you can check out my complete step-by-step guide here: How to Winter Sow Seeds Outdoors

So when it comes to starting larkspur from seed, winter sowing is truly my go-to method. If you want gorgeous, healthy spires of larkspur in your garden this year, let me show you exactly how I do it.

(Posts on stacyling.com may contain affiliate links. Click HERE for full disclosure.)

Getting to Know Larkspur Flower: A Cottage Garden Gem

Larkspur (Consolida ajacis), with its tall, elegant spires of blossoms, is a beloved cottage garden classic. These beautiful flowers (also known as delphinium or knight’s spur) bring a touch of old-fashioned charm and vibrant color to any garden setting.  

Native to the Mediterranean region, larkspur has been cultivated for centuries, admired for its delicate beauty and symbolism of love, lightness, and joy. The flowers come in a wide array of hues, including shades of blue, purple, pink, white, and even red.  

Larkspur typically reaches heights of 2 to 5 feet, depending on the variety, making it a striking vertical accent in garden borders and bouquets. Its sturdy stems and long vase life make it a favorite among flower farmers and floral designers alike.

Whether gracing a cottage garden with its whimsical charm or adding a touch of elegance to a cut flower garden, larkspur is a beautiful flower that will make a statement. Keep in mind that most larkspur varieties are annuals, but some are biennials (taking two years to complete their life cycle). In my garden, they have reseeded themselves year after year too!

• Hardiness Zone: Larkspur is hardy in Zones 2-10.
• Light: Full sun is best, but some afternoon shade is appreciated in hot climates.
• Soil: Well-drained soil is crucial. Larkspur prefers a slightly alkaline pH.
• Bloom Time: Late spring to early summer.
• Deer Resistance: Larkspur is generally deer-resistant.

I’ve been growing larkspur in my both my cottage and cutting gardens for several years and love the height, texture, and drama it adds every growing season.

Why Winter Sowing Works Wonders for Larkspur Flowers

Larkspur, like sweet peas, prefers cool temperatures for germination and growth. Winter sowing mimics their natural growth cycle by exposing the seeds to the fluctuating temperatures and natural moisture of winter. This results in:

• Higher Germination Rates: Larkspur seeds benefit from a period of cold stratification, which winter sowing naturally provides. This leads to more successful germination.
• Stronger Seedlings: Winter-sown larkspur seedlings develop robust root systems and are better equipped to withstand the challenges of the garden.
• Less Work for Me: No more fussing with indoor seed starting setups. I simply sow my seeds in their recylced mini greenhouses and let nature take its course. Easy peasy!

If you’re new to this method and want a full walkthrough of how winter sowing works, you can check out my complete step-by-step guide here: How to Winter Sow Seeds Outdoors

Winter Sowing Larkspur Seed Supplies

• recycled clear plastic containers
• larkspur seeds (I usually order mine from Johnny’s Selected Seeds.)
• organic potting soil

Winter Sowing Larkspur Flowers: My Tried-and-True Method

Here’s how I winter sow larkspur, based on my own experience and backed by .edu research:

1. Timing is Key: Aim to sow your larkspur seeds in late fall or early winter, before the ground freezes solid. I usually winter sow my larkspur flower in January.
2. Container Choice: I use recycled milk jugs or clear plastic clamshell containers with drainage holes in my zone 6b garden.
3. Soil Matters: Fill your containers with a good quality potting soil or seed-starting mix that is premoistened. Larkspur prefers well-drained soil.
4. Sowing Depth: Sow the seeds shallowly, about ¼ inch deep.
5. Location, Location, Location: Place your mini greenhouses in a sunny spot outdoors. Make sure they are in a protected location so nothing messes with your seedlings.
6. Patience is a Virtue: Now, wait for spring! The seeds will germinate when the time is right. Keep an eye on the soil and water if it gets dry.
7. Transplant Time: Once the danger of frost has passed, transplant your larkspur seedlings into your garden. I have to admit, I have so many seedlings to plant that I get started planting my larkspur a bit earlier. They are already hardened off and I keep an eye on the weather for damaging freezes.

My Simple Winter Sowing Setup

You can learn even more about how to make them and what to do with them in my post, “How to Winter Sow Seeds Outdoors” The fluctuating temperatures and natural precipitation do the rest, and by spring, I have sturdy little sweet pea seedlings ready to be transplanted into my garden.

Zone 6b and Beyond: Is Winter Sowing Right for You?

If you live in a region with cold winters and a defined frost period, winter sowing is absolutely worth trying. This method is especially effective in Zones 3–7, where the natural winter conditions provide the perfect cold stratification larkspur seeds need. Even gardeners in warmer climates can adapt the technique by sowing earlier in the cool season. As a trained Master Gardener who has grown larkspur for many years in my Zone 6B garden, I’ve consistently seen stronger, healthier seedlings from winter sowing compared to traditional indoor methods. The plants are sturdier, more resilient, and far better adapted to the outdoor environment from day one.

Growing Larkspur Flowers with Success: From Seedling to Bloom

Winter sowing gives your larkspur a strong start, but proper care in the garden is essential to unlock their full potential. Here’s how to ensure your larkspur thrives:

• Light: Provide a location with at least 6 hours of direct sunlight per day. Some afternoon shade can be beneficial in hotter climates.
• Soil: Well-drained soil is crucial for larkspur. Amend heavy clay soil with compost to improve drainage. Larkspur prefers a slightly alkaline pH (around 7.0).
• Thinning Out Seedlings/Spacing: Space plants about 12-18 inches apart to allow for good air circulation.
• Watering: Water regularly, especially during dry periods. Aim for consistent moisture, but avoid overwatering, which can lead to root rot.
• Fertilizing: Feed your larkspur with a balanced fertilizer every 4-6 weeks to encourage strong growth and abundant blooms.
• Supporting: Larkspur can grow quite tall (some varieties reach 5 feet or more!). Provide support with stakes, twine, or grow-through supports to prevent them from flopping over.
• Deadheading: Regularly remove faded flower spikes to encourage continuous blooming and prevent the plants from setting seed prematurely. This can significantly extend the flowering season.
• Pest and Disease Control: Keep an eye out aphids and slugs. Treat any infestations organically and promptly. I shared a great list of organic solutions here. Be mindful of fungal diseases, especially in humid conditions. Ensure good air circulation by spacing plants adequately.

Favorite Larkspur Flower Varieties

Some of my favorite larkspur flower varieties to grow include:

• Fancy Smokey Eyes
• Early Grey
• QIS Light Blue
• QIS Light Pink

Ready to Give Winter Sowing a Try?

As a trained Master Gardener with decades of experience growing in Zone 6B, I’ve tried just about every method for starting larkspur from seed—and winter sowing consistently gives me the strongest, healthiest, and most resilient plants. This cool-season annual truly thrives when it germinates outdoors in the cold, and winter sowing mimics those natural conditions better than anything I’ve done indoors under lights.

If you haven’t tried winter sowing larkspur yet, I can’t recommend it enough. It’s simple, low-maintenance, and incredibly fun, especially for busy gardeners who still want beautiful, robust blooms in their cutting garden. Give it a try this season and see the difference for yourself.

Happy gardening!

Want to learn more about starting larkspur seeds? Check out these helpful resources:

• Read more of my Winter Sowing Guide here
• Want to start sweet peas indoors? Read my comprehensive article here about how to start seeds under grow lights anywhere in your home.

For more information about growing larkspur flower, please see this article from the Arkansas Cooperative Extension Service.

To drill down on more beginner gardening techniques and tips, please read these posts:

• Flower Gardening for Beginners
• Growing a Cut Flower Garden for Beginners
• Container Garden Ideas for Beginners
• How to Start a Vegetable Garden
• Herb Gardening for Beginners

Thank you for visiting the blog today!

Enjoy your day! xo