How to Grow Snapdragon
Annual
Snapdragons (Antirrhinum majus) are cool-season flowers prized for their tall spikes of hinged, dragon-shaped blooms that children love to squeeze open and shut. US gardeners grow them for their long-lasting color, wide range of shades, and their willingness to keep flowering when nights are cool. Though often treated as annuals, they are short-lived perennials in mild-winter regions and may overwinter or reseed in the South and West.
Planting
Snapdragons grow best in full sun and well-drained soil rich in organic matter, with a slightly acidic to neutral pH. In most of the country, set out transplants in early spring a few weeks before the last frost, since young plants tolerate light frost and actually flower better when established during cool weather; in mild-winter areas of the South and West, plant in fall for winter and early spring bloom. To start from seed, sow indoors about 8 to 10 weeks before the last frost and press the tiny seeds onto the surface without covering them, because they need light to germinate. Space plants roughly 6 to 12 inches apart depending on whether you are growing dwarf, medium, or tall types.
Care
Keep the soil evenly moist, providing about an inch of water per week and watering at the base to keep the foliage dry and reduce disease. Feed lightly at planting and again during active growth by working compost into the bed or using a balanced flower food, and mulch to conserve moisture and keep roots cool. Pinch young plants when they are a few inches tall to encourage bushier growth, and deadhead spent spikes regularly to prolong blooming; taller varieties benefit from staking or a grow-through support so the flower stalks do not flop. As heat arrives in summer, plants may slow or stop; cutting them back can spark a fresh flush of bloom once cooler weather returns.
Bloom time
Snapdragons bloom heavily in the cool weather of spring and again in fall, and can flower for many weeks wherever summers stay mild. In hot-summer regions bloom pauses during the heat and resumes when temperatures drop.
Garden uses
They make excellent long-stemmed cut flowers with a long vase life and add strong vertical color to borders, beds, and cottage-style plantings. Dwarf types work well in containers and edging, and the blooms attract bees and other pollinators.
Tips
Choose the height class that fits your purpose: tall varieties for cutting, mid-size for borders, and dwarf for pots and edges. Harvest cut stems when the lower third of the flowers are open for the longest vase life, and plant snapdragons early so they can establish before summer heat. Good spacing and air movement keep the foliage healthy through the cool, damp weather they enjoy.
General guidance for US gardens. Timing and hardiness vary by region; check your local frost dates and hardiness zone. Page updated Aug 4, 2026.