← Plant Guides

How to Grow Snapdragon Sonnet

Wikimedia Commons

Snapdragon Sonnet

Antirrhinum majus 'Sonnet'

flower

Snapdragon Sonnet is a compact ornamental flower variety known for its vibrant, densely-packed flower spikes and relatively short stature. It produces tall, cylindrical flower clusters in a wide range of colors and blooms prolifically throughout the growing season. This variety is popular for garden beds, containers, and cut flower arrangements.

Looking for a specific variety?

Sonnet Rose Sonnet White Sonnet Red Sonnet Pink Sonnet Yellow Sonnet Mixed Colors

When should you plant Snapdragon Sonnet in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Snapdragon Sonnet timeline →

Example Snapdragon Sonnet timeline · Pittsburgh, PA (Zone 6b)

  1. Plant Snapdragon Sonnet

    Around Apr 17

    Near Pittsburgh's average last spring frost.

  2. Tend & protect

    Late spring–summer

    Watering, feeding, and pest-watch reminders.

  3. First Snapdragon Sonnet blooms

    Around Jun 26

    ≈ 70 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Snapdragon Sonnet dates for your own zip code.

Growing Conditions

☀️
Sun: Full sun, 6-8 hours daily; tolerates partial shade in hot climates
💧
Water: Keep soil consistently moist but not waterlogged. Water at soil level in the morning. Reduce watering as plants mature. Drought-tolerant once established but flowers will be smaller.
📏
Spacing: 9-12 inches
📅
Days to maturity: 70-90 days from seed to first flowers
🌱
Planting depth: Press seeds lightly onto soil surface; they need light to germinate. Do not cover.

Soil

Type: Well-draining loamy soil
pH: 6.0-7.0
Amendments:
Compost Peat moss or coconut coir Perlite for drainage

Growing Zones

Find your zone →

Zones 2-10 as an annual; can overwinter in zones 8-10

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a

Sign up free to see if Snapdragon Sonnet grows in your zone — and get a personalized planting timeline.

Get my Snapdragon Sonnet timeline →

Growth Stages

1

Germination

7-14 days

Tiny seedlings emerge with two cotyledons (seed leaves). Plants are delicate and may appear translucent.

Maintain 70-75°F soil temperature. Keep soil moist but not soggy. Provide bright light immediately after germination. Use a heating mat if starting indoors in cool conditions.

2

Seedling

3-4 weeks

True leaves develop; plants are 2-4 inches tall with several leaf sets. Growth is still slow and tender.

Thin seedlings to proper spacing. Provide 14-16 hours of bright light daily. Keep soil consistently moist. Avoid overcrowding to prevent damping-off disease.

3

Vegetative

3-5 weeks before flowering begins

Plants establish bushy growth with many leaves and side shoots. Plant height reaches 12-24 inches depending on variety selection and conditions.

Pinch growing tips when plants are 4-6 inches tall to encourage bushier growth and more flower spikes. Transplant to garden or larger containers after last frost. Begin hardening off if starting indoors.

4

Flowering

8-12 weeks or more with deadheading

Tall, dense flower spikes emerge with tightly packed florets opening sequentially from bottom to top. Colors range from reds, pinks, oranges, yellows, whites, and purples.

Deadhead spent flowers regularly to extend blooming season. Water regularly but avoid wetting flowers. Fertilize every 2-3 weeks with balanced fertilizer. Stake tall varieties if needed.

5

Seed Setting

3-4 weeks after flowering ends

If flowers are not deadheaded, seed pods develop below fading flowers. Pods are brownish, bean-shaped capsules containing hundreds of tiny seeds.

Allow some flowers to finish naturally if collecting seeds. Cut seed pods when they turn brown and dry; store in cool, dry place. Remove most spent flowers to prevent self-seeding in garden.

Companion Planting

Plan your garden →

Plant with:

Alyssum Salvia Cosmos Marigold Zinnia Cleome Sweet pea Dahlias Dianthus

Avoid planting near:

Root vegetables (they compete for space) Heavy feeders like corn and tomatoes (in small garden beds)

Common Pests

  • Spray with strong water stream; use insecticidal soap or neem oil. Encourage beneficial insects like ladybugs.

  • Use yellow sticky traps; spray with neem oil or insecticidal soap. Remove heavily infested leaves.

  • Increase humidity; spray with water daily. Use neem oil or horticultural oil if severe.

  • Improve air circulation by spacing plants properly. Remove infected leaves. Use fungicide if severe. Avoid overhead watering.

  • Ensure good air circulation. Spray with sulfur-based fungicide or baking soda solution (1 tbsp per gallon water). Water at soil level.

  • Use sterile seed-starting mix. Avoid overwatering. Ensure good ventilation. Remove affected seedlings immediately.

Uses

🍳

Edible Flowers

Culinary

Snapdragon petals are mildly flavored and add visual appeal to salads and desserts. They are completely edible with no toxins when grown without pesticides. [source]

🏠

Cut Flower Arrangements

Household

Snapdragon Sonnet's tall, densely-packed flower spikes make it an excellent choice for fresh flower bouquets, floral arrangements, and wedding centerpieces. They hold their blooms well in water. [source]

🎨

Dried Flowers & Seed Pods

Craft

Snapdragon flowers dry beautifully and retain color for dried arrangements. The distinctive bean-shaped seed pods are prized for dried craft projects and add unique texture to dried bouquets. [source]

🦋

Pollinator Support

Wildlife

Snapdragons attract bees and other pollinators with their nectar and readily accessible flower structure. They provide good forage for these beneficial insects throughout the blooming season. [source]

💊

Traditional Herbal Use

Medicinal

Snapdragon has been used in traditional European herbalism for respiratory support and skin health, though modern scientific evidence is limited. Used as herbal tea from flowers and leaves. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Cut snapdragon flower spikes in the morning when lower flowers are open but upper buds are still tight. Cut stems at a sharp angle below a leaf node. Remove lower leaves that would sit in water. Change water every 2-3 days. Snapdragons typically last 10-14 days in a vase. Deadhead spent flowers on living plants to encourage continuous blooming.

Fun Facts

  • 🌱 Snapdragon seed pods resemble tiny human skulls, which is why the plant was historically called 'skull flower' and associated with dark magic in medieval Europe.
  • 🌱 The flower's unusual two-lipped shape (bilateral symmetry) is specifically adapted to bee pollination—bees land on the lower 'lip' and their weight opens a valve to reveal pollen.
  • 🌱 Snapdragon seeds are so tiny that one snapdragon plant can produce over 5,000 seeds, and these seeds remain viable for up to 3 years when stored properly.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Deadhead Full Sun Germination Hardening Off Partial Shade Transplant True Leaves
Shop Snapdragon Sonnet plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Snapdragon Sonnet planting timeline

Tell us your zip code and we'll calculate exactly when to start Snapdragon Sonnet seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Snapdragon Sonnet timeline →