Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Larkspur — Growing reference
| Scientific name | Consolida ajacis |
|---|---|
| Seed germination (days) | 14–21 |
| Soil temperature for germination (°C) | 10–18.3 |
| First harvest or flowering (days) | 65–100 |
| Measured from | Seed |
| Plant spacing (cm) | 15.2–30.5 |
| Mature height (cm) | 45.7–121.9 |
| Mature spread (cm) | 15.2–25.4 |
| USDA hardiness zones | 3–9 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Sow seed 1/8 in deep directly in the garden as early as the ground can be worked — larkspur germinates best in cool soil below 65°F and may fail to sprout if the weather turns warm. Do not start indoors, as plants have taproots that do not transplant well. Thin to 9–12 in to promote sturdy stems. Allow some seed to fall for reliable self-sowing in subsequent years.
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