How to grow Snapdragon

At a glance

🌱 Grow your Snapdragon with GardenDex

• Reminders to water it, timed to your weather and whether it's in a pot
• Frost and disease alerts for your garden, the night before
• Follow it from seed to harvest, and see what your garden grew in $
• Point your camera at any plant or bug to identify it

🗓️ When to plant

Sow seeds indoors 6–8 weeks before the last spring frost, or direct sow outdoors after the last frost when soil is workable. In mild climates, you can also sow in autumn for winter flowering.

🌰 How to plant

1. Sprinkle tiny seeds on moist seed-starting mix without covering (they need light to germinate).
2. Keep the seed tray at 15–21°C (60–70°F) in bright, indirect light for 7–14 days until seedlings emerge.
3. Transplant seedlings to individual pots once they have two true leaves, then harden off before moving outdoors.
4. Plant in garden or containers after the last frost, spacing according to variety size.

💧 Care

• Pinch out the top growing tip when seedlings are 10–15 cm (4–6 in) tall to encourage bushier, more branching plants.
• Deadhead spent flowers regularly to extend blooming and promote new flower production.
• Stake tall varieties with twine or garden stakes to prevent wind damage and keep plants upright.
• Fertilize every 2–3 weeks with a balanced, diluted liquid fertilizer to sustain flowering.

🧺 Harvest

Cut snapdragon stems in early morning when the lowest flowers are just opening, cutting at least halfway down the stem to encourage reblooming. They last 7–10 days in a vase with fresh water.

🐛 Common problems

Rust (fungal disease): Remove affected leaves, improve air circulation, and avoid wetting foliage; treat with sulfur or fungicide if needed.

Aphids: Spray with a strong water jet or use insecticidal soap to dislodge and eliminate pests.

Powdery mildew: Ensure good air circulation, avoid overhead watering, and apply sulfur-based fungicide if infection occurs.

🤝 Companion plants

💚 Good neighbours: Lavender, Cosmos, Larkspur, Salvia

⚠️ Keep apart from: Fennel, Dill

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