Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Jalapeno — Growing reference
| Scientific name | Capsicum annuum |
|---|---|
| Seed germination (days) | 8–14 |
| Soil temperature for germination (°C) | 23.9–29.4 |
| First harvest or flowering (days) | 70–85 |
| Measured from | Transplant |
| Plant spacing (cm) | 35.6–45.7 |
| Mature height (cm) | 61–91.4 |
| Mature spread (cm) | 45.7–61 |
| USDA hardiness zones | 4–11 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | indoor-start |
Growing directions
Sow seeds 1/4 inch deep in a warm starting mix and maintain soil temperature above 75°F for best germination. Transplant to the garden once nights are reliably warm and the soil is fully settled. For hotter fruit, allow stress by reducing water slightly as fruits mature. Harvest at 3–4 inches long while still firm and dark green, or leave on the plant until red for a milder, slightly sweeter heat.
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