How to Grow Snapdragon (Antirrhinum)
Annual
Snapdragons, also called antirrhinums, bring upright spires of richly coloured flowers to summer displays. They are usually grown as annual bedding in the UK, though mild winters may see plants survive briefly. Their distinctive flowers suit traditional borders, containers and cutting gardens, and compact varieties are especially useful in pots.
Planting
Sow fine seed on the surface of moist seed compost from February to April, without covering it, at about 18 degrees C. Prick out seedlings once manageable and grow them on in bright conditions. Harden off before planting 20 to 30 cm apart after the last spring frost. Alternatively buy plug plants or bedding plants in May. In colder northern and Scottish gardens, delay planting until conditions are settled and protect young plants from cold winds.
Care
Plant in sun or light shade in fertile, free-draining soil. Water during dry spells, particularly for container plants, and deadhead spent flower spikes to encourage side shoots and repeat bloom. Taller varieties may need discreet support. Avoid crowding plants, and remove any fading leaves. A light mulch helps keep roots cool and conserves moisture in summer.
Bloom time
Snapdragons usually flower from June to October. Removing old spikes encourages further flowering, and plants may continue until the first hard frosts in a sheltered southern garden. Summer bloom can be shorter in cold, exposed areas.
Garden uses
Use dwarf snapdragons to edge beds and fill patio containers, and place tall varieties through cottage-style borders or cutting beds. Their vertical shape is valuable among rounded flowers such as marigolds and petunias. Open flowers are visited by larger bees, especially where planting includes other RHS Plants for Pollinators selections.
Tips
For bushier plants, pinch out the main shoot once young plants are established, unless growing a tall cutting variety. Choose a sheltered position, as flowering stems can snap in strong wind. Lift and compost plants after frost damage rather than expecting them to overwinter reliably in colder gardens.
Growing Snapdragon (Antirrhinum): frequently asked questions
How do I grow snapdragon (antirrhinum) in the UK?
Sow fine seed on the surface of moist seed compost from February to April, without covering it, at about 18 degrees C.
When does snapdragon (antirrhinum) flower?
Snapdragons usually flower from June to October.
How do I care for snapdragon (antirrhinum)?
Plant in sun or light shade in fertile, free-draining soil.
General guidance for UK gardens. Timing and hardiness vary by region and season; the RHS or a local garden centre can advise for your area. Page updated 19 Sep 2026.