How to grow Snapdragon Seeds
Snapdragons are colourful, cool-season flowers that bring elegant flower spikes to pots, borders, cottage gardens and pollinator-friendly planting schemes.
When to Sow Snapdragon Seeds
In cooler climates, sow indoors 8–10 weeks before the last expected frost. In mild Mediterranean climates, sow from late summer through autumn for winter and spring flowers, or in late winter for spring flowering.
Germination
Keep the compost evenly moist at approximately 18–21°C. Snapdragon seeds usually germinate within 7–14 days and need light to germinate successfully.
Preparing the Soil
Choose fertile, well-drained soil and remove weeds before planting. Adding a little compost can improve the soil, but avoid overly rich conditions that encourage soft, leafy growth.
Sowing Seeds
Surface sow the tiny seeds onto moist seed-starting compost and gently press them into place. Do not cover them, as they need light to germinate. Mist carefully or water from below to avoid displacing the seeds.
Transplanting
Transplant seedlings into individual cells or small pots once they have developed their first true leaves. Harden them off gradually before planting outside, spacing them approximately 20–30 cm apart.
Sunlight & Temperature
Snapdragons flower best in full sun during cool weather and will also tolerate partial shade. In hot Mediterranean climates, morning sun and some protection from intense afternoon heat can help extend flowering.
Watering
Keep the soil moderately moist while plants become established and produce flower spikes, but do not allow it to become waterlogged. Water at the base of the plants to help keep the foliage dry.
Pinching & Support
Pinching out the central growing tip when young plants have several sets of true leaves encourages bushier growth and more flower stems. Tall varieties may need support in windy or exposed positions, while compact varieties generally do not.
Maintenance
Provide good air circulation and monitor plants for aphids, rust, slugs and snails. A light feed during flowering can benefit plants grown in pots, but avoid excessive fertiliser.
Deadheading
Remove faded flower spikes regularly to prevent seed production and encourage more blooms. After the first flush, cut stems back to healthy leaves to help stimulate another display.