Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Calendula — Growing reference
| Scientific name | Calendula officinalis |
|---|---|
| Seed germination (days) | 7–14 |
| Soil temperature for germination (°C) | 12.8–18.3 |
| First harvest or flowering (days) | 45–70 |
| Measured from | Seed |
| Plant spacing (cm) | 20.3–30.5 |
| Mature height (cm) | 30.5–61 |
| Mature spread (cm) | 25.4–35.6 |
| USDA hardiness zones | 2–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Sow seed 1/4 in deep in cool, well-drained soil in early spring. Calendula prefers cool weather and will slow or stop blooming when summer heat arrives, often rebounding in fall. Deadhead consistently to prevent seed set and extend the blooming period. The ray petals are edible and can be used as a garnish or in salads.
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