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in Gardening and Planting· Spring· Starting a Cut Flower Garden Series· Tips and Tutorials· Winter

How to Sow Snapdragon Seeds Indoors

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Have you ever thought about growing good old-fashioned snapdragons in your garden? I’ll share my tips on sowing snapdragon seeds indoors, how to transplant them into the garden, and much more.

snapdragons in a cottage garden

Snapdragons are one of my very favorite cut flowers in the garden. I first tried my hand at growing them from seed 3 years ago. After seeing these beauties in the Floret Flower Farm Cut Flower Garden book, I knew I needed them in my cottage garden.

These beautiful blooms produce gorgeous spikes and are one of the most productive early summer flowers in the garden. And my favorite part about snapdragons? The more you cut, the more they bloom!

snapdragons in a cottage garden
Snapdragon Sherbet Toned Chantilly Mix

Affiliate links are used for your convenience. Read my full disclosure here.

I’m a self-taught hobby gardener, not a Master Gardener. Everything I share with you on my blog is my personal opinion and things that have worked for me along the way.

Madame Butterfly Deep Red snapdragons
Madame Butterfly Dark Red Snapdragon | Credit: Floret Flowers

I’ve grown the same variety of snapdragons each year and just can’t get over how beautiful the Sherbet Toned Chantilly Mix colors are. But I’ve decided to up my game this season and will be trying the Madame Butterfly Dark Red Mix as well.

There’s a difference between the compact-sized snapdragons you buy at a garden store or nursery, and the flowers you grow from seeds like these. The smaller sizes are great to use in outdoor planters and window boxes, but these are specifically grown for cut flowers.


Sherbet Toned Chantilly Mix snapdragons

When to Plant Snapdragon Seeds

In order to give your snapdragons the longest blooming season possible, start sowing your snapdragon seeds indoors 8-10 weeks before the last frost in your area (I am in Zone 8B and have an average last frost date of April 18th). Snapdragons germinate best in cooler temperatures.

You can also sow the seeds directly in the garden after the last hard frost in spring because snapdragon plants can tolerate light frost. Plant in loose, rich soil and full sunlight. Sprinkle snapdragon seeds lightly on the surface of the soil, then press them lightly into the soil. Snapdragon seeds won’t germinate without light, so don’t cover the seeds. Water as needed to keep the soil evenly moist, but be careful not to overwater.


sowing snapdragons seeds

Supplies to Sow Seeds

  • Snapdragon Seeds (I buy mine at Floret Flower Farm)
  • Seed Starter Potting Mix
  • Containers 
  • Drainage Tray
  • Plastic Dome Lid
  • Labels

Steps for Sowing Snapdragons

sowing snapdragons seeds

Step 1 – Fill Container with Soil

I would recommend using a good quality seed starting potting soil when sowing your snapdragon seeds. Good soil will make all the difference in the world. The soil should be moistened before adding it to the container.

BENEFITS TO USING A SEED STARTING MIX

  • Helps to germinate quickly
  • Holds the moisture
  • Allows the roots to penetrate down into the garden soil quickly.

You can make the mix go even further by filling the bottom half of the container with regular potting soil and then filling the rest of it with the seed starting mix, where the seeds are going to be placed.

snapdragon seeds

Step 2 – Sowing the Seeds

Because the seeds are so small, I use a slightly damp toothpick and pick up 2 seeds, placing them into the seed tray cell. Sprinkle a light layer of seed starting soil or vermiculite to lightly cover the top.

seeds in cell containers and being bottom watered

Step 3 – Bottom Water

Bottom watering is the most gentle and easy way to water your snapdragon seedlings. Fill a drainage tray with about an inch of water and let the container sit in the tray to evenly moisten the soil. DO NOT leave the container in a tray full of water for more than an hour.

plastic dome lid covering snapdragon seeds

Step 4 – Cover

Cover your container with a plastic dome lid to increase the humidity and speed up the germination process.


greenhouse with seedlings

Other Notes

  • Place in a cool greenhouse or in a bright window in the house. If you are sowing the seeds in a space with little light, place the plants 3-4 inches below fluorescent light bulbs or grow lights. Leave the lights on for 16 hours per day and turn them off at night.
  • Bottom heat isn’t necessary for snapdragon germination.
  • Be sure the seedlings have plenty of air circulation. A small fan placed near the seedlings will help prevent mold, and will also encourage stronger, healthier plants.
  • Water as needed to keep the potting mix evenly moist, but you never want to overwater and cause the soil to become oversaturated.

transplanted snapdragon seedlings in raised bed

Once the Sweet Peas Have Germinated

Take the plastic lid off the container once the seeds have germinated.

Snapdragons are pretty tolerant of the cold and can survive a light frost or two. You can transplant your seedlings into the garden a few weeks before the last frost date of the season, once the plants have 3 sets of true leaves.

Make sure to amend the garden beds with compost and organic fertilizer prior to planting. Space the snapdragon seedlings 9 inches apart.


snapdragons in a cottage garden

Pinching

Once a snapdragon plant is 4-6 inches tall and has at least 3 sets of leaves on each stalk, start pinching it back to encourage the plant to actively branch from the base. This also helps to produce more blooms. Snip off the central growing tips just above leaf joints and continue this throughout the growing season.

Netting

Once the snapdragon plants grow to about six inches tall, add a layer of soft mesh trellis netting to the beds to keep heavy stems from toppling over in the rain and wind.

snapdragons in a cottage garden

I hope this inspires you to grow some snapdragon seeds of your very own. I’d love to hear what you’ll be growing in your gardens this year. Be sure to leave me a comment.


You Don’t Need a Greenhouse

My friend Stacy at Bricks ‘n Blooms has a great blog post on everything you need to know about sowing seeds indoors. So for those of you that don’t have greenhouses, you can still grow flowers from seed.


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Other Posts You May Enjoy…

  • How to Prepare Your Cut Flower Garden Beds
  • How to Grow Sweet Peas From Seed
  • Step-by-Step Tutorial on the Seed Sowing Process
  • Seed Starting 101 – Growing a Cut Flower Garden Series
  • Planning Your Cut Flower Garden
  • Supplies Needed for Seed Starting

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Filed Under: Gardening and Planting, Spring, Starting a Cut Flower Garden Series, Tips and Tutorials, Winter

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Comments

  1. Anne Zirkle says

    03/05/2021 at 11:10 am

    I never realized there was a difference in the size of the snap dragon plants! I always just thought yours were so much bigger because of the miraculous PNW growing environment! You always make it sound so easy and doable, Kim.

    • Kim says

      03/07/2021 at 10:24 pm

      That’s so funny Anne! They really are an easy flower to grow. The only annoying part is netting them, but even that isn’t too bad. Thanks for visiting!

  2. stacy says

    03/06/2021 at 5:06 am

    Great post! I have only grown the ones you buy at the nursery so I am super excited to start these from seed! I think I have chantilly mix – I have to check the packet! xoxoxo

    • Kim says

      03/07/2021 at 10:29 pm

      You are going to love them so much Stacy! I’m so excited you’re growing them this year.

  3. Jayne says

    03/07/2021 at 12:47 pm

    Sowing snapdragons today for the first time. I followed all your advice, let’s hope I can keep them alive!

    • Kim says

      03/07/2021 at 10:29 pm

      I know they will be amazing! I can’t wait to see Jayne!

  4. Jennifer Dynys says

    03/11/2021 at 8:25 pm

    Hey there Kim! I love this post, if you don’t mind I am linking to it in my weekly round-up!

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Meet Kim

Hi! I’m Kim! I live in a beach cottage on the PNW’s Puget Sound with my husband and pups, Lucy and Jax. I have a passion for home decor and gardening and can't wait to share life in the PNW with you! Read More…

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