Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Dahlia — Growing reference
| Scientific name | Dahlia pinnata |
|---|---|
| First harvest or flowering (days) | 90–120 |
| Measured from | Transplant |
| Plant spacing (cm) | 45.7–91.4 |
| Mature height (cm) | 45.7–182.9 |
| Mature spread (cm) | 45.7–91.4 |
| USDA hardiness zones | 8–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Tuber |
Growing directions
Plant tubers horizontally 4–6 in deep with the eye pointing up after the last frost when soil reaches 60°F; set a stake at planting time to avoid spearing the tuber later. Pinch the growing tip when plants are 12 in tall to encourage branching and more flowers. In zones below 8, dig tubers after the first killing frost, cure them for a week, then store in slightly damp peat at 40–50°F through winter. Disbudding side buds around the main bud produces exhibition-quality blooms.
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