Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Impatiens — Growing reference
| Scientific name | Impatiens walleriana |
|---|---|
| Seed germination (days) | 14–21 |
| Soil temperature for germination (°C) | 21.1–23.9 |
| First harvest or flowering (days) | 60–80 |
| Measured from | Transplant |
| Plant spacing (cm) | 20.3–30.5 |
| Mature height (cm) | 15.2–61 |
| Mature spread (cm) | 20.3–45.7 |
| USDA hardiness zones | 3–11 |
| Light | Shade |
| Water | Moderate |
| Sowing method | indoor-start |
Growing directions
Sow tiny seed on the surface of moist starting mix without covering — light is required for germination. Impatiens are one of the most reliable shade-tolerant annuals and will self-clean most spent flowers. Pinch plants back once after transplanting to encourage compact, bushy growth. Water consistently; wilting in heat is common and plants recover overnight, but chronic drought reduces flowering.
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