Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Snapdragon — Growing reference
| Scientific name | Antirrhinum majus |
|---|---|
| Seed germination (days) | 10–14 |
| Soil temperature for germination (°C) | 18.3–21.1 |
| First harvest or flowering (days) | 75–100 |
| Measured from | Transplant |
| Plant spacing (cm) | 15.2–30.5 |
| Mature height (cm) | 20.3–91.4 |
| Mature spread (cm) | 15.2–30.5 |
| USDA hardiness zones | 3–10 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | indoor-start |
Growing directions
Press seed onto the surface of moist starting mix and do not cover — seed needs light to germinate. Pinch seedlings once to promote multiple spikes. Transplant to the garden a few weeks before the last frost, as snapdragons thrive in cool conditions and can tolerate a light freeze. After the primary spike blooms, cut it off to encourage a second flush from side branches.
Source and local conditions
Typical planning ranges from OpenPlantDB (CC0). Cultivar, climate, season and growing method can change these values. Confirm the seed label and local guidance before planting.
Source & verification
OpenPlantDB · CC0