Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Clarkia — Growing reference
| Scientific name | Clarkia amoena |
|---|---|
| Seed germination (days) | 7–14 |
| Soil temperature for germination (°C) | 12.8–18.3 |
| First harvest or flowering (days) | 60–90 |
| Measured from | Seed |
| Plant spacing (cm) | 22.9–30.5 |
| Mature height (cm) | 45.7–91.4 |
| Mature spread (cm) | 22.9–30.5 |
| USDA hardiness zones | 2–11 |
| Light | Full sun |
| Water | Low |
| Sowing method | Direct sow |
Growing directions
Direct sow on the soil surface or barely cover; seeds germinate best at cool soil temperatures and seedlings dislike transplanting. Thin ruthlessly to 9–12 in because overcrowded plants bloom poorly and are prone to powdery mildew in humid conditions. Clarkia thrives on neglect in poor, well-drained soil — fertilizing too heavily causes lush foliage at the expense of flowers. Plants naturally set seed and die when summer heat arrives; in mild-winter climates, sow in fall for late-winter to spring bloom.
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