How to Grow Snapdragon
Antirrhinum majus
Snapdragons are vibrant annual flowers beloved for their tall spikes of colorful blooms that add vertical interest to borders. Gardeners prize them for their ease of growth and ability to thrive in cool weather conditions before the heat sets in.
📷 Wikipedia: Antirrhinum majusStarting Snapdragon: indoors or direct sow?
🏠 Start indoors 6 weeks before your last spring frost, then move the seedlings outside.
Start seeds indoors six weeks before the last frost date, then harden off seedlings gradually before moving them outdoors once temperatures are stable.
Soil, care & harvest
Prepare soil with a pH between 6.2 and 7.0, ensuring good drainage. As a cool-season annual, start seeds indoors six weeks before your last frost date or direct sow immediately after the danger of frost has passed. Press seeds gently into the soil surface without covering them deeply, as they require light to germinate successfully within seven to fourteen days.
Space plants six to twelve inches apart to allow for healthy growth. While they grow upright, staking tall varieties prevents stems from snapping in wind. Water moderately when the top inch of soil feels dry, and apply a balanced fertilizer occasionally during the blooming period to encourage continuous flowers throughout the season.
Watch for aphids or fungal issues like powdery mildew; prevent pests by keeping plants clean and ensuring good air circulation. Snapdragons are grown for ornamental display rather than harvest, so enjoy them while they bloom in spring and early summer. Deadhead spent flowers regularly to prolong the show.
When to Plant Snapdragon
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | May – June | July – September | — |
| Zone 2 | April – May | June – August | — |
| Zone 3 | April – May | June – August | — |
| Zone 4 | March – April | June – July | — |
| Zone 5 | March – April | May – July | — |
| Zone 6 | March – April | May – July | — |
| Zone 7 | February – March | April – June | — |
| Zone 8 | February – March | April – June | — |
| Zone 9 | January – February | March – May | — |
| Zone 10 | January | February – April | — |
| Zone 11 | January | January – March | — |
| Zone 12 | January | January – March | — |
| Zone 13 | January | January – March | — |
