Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Viola — Growing reference
| Scientific name | Viola tricolor |
|---|---|
| Seed germination (days) | 10–14 |
| Soil temperature for germination (°C) | 18.3–21.1 |
| First harvest or flowering (days) | 50–70 |
| Measured from | Transplant |
| Plant spacing (cm) | 10.2–20.3 |
| Mature height (cm) | 10.2–20.3 |
| Mature spread (cm) | 15.2–25.4 |
| USDA hardiness zones | 3–10 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | indoor-start |
Growing directions
Sow seed 1/8 in deep in a cool, moist starting mix; darkness during germination is beneficial. Violas are more petite and heat-tolerant than pansies, often self-sowing prolifically in the garden. Deadhead to extend flowering, or allow seed to set for naturalized self-seeding the following year. They shine in early spring containers and border edges.
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