Iceland Poppy — Growing reference
| Scientific name | Papaver nudicaule |
|---|---|
| Seed germination (days) | 10–14 |
| Soil temperature for germination (°C) | 10–15.6 |
| First harvest or flowering (days) | 90–120 |
| Measured from | Seed |
| Plant spacing (cm) | 22.9–30.5 |
| Mature height (cm) | 30.5–61 |
| Mature spread (cm) | 15.2–22.9 |
| USDA hardiness zones | 2–10 |
| Light | Full sun |
| Water | Moderate |
| Sowing method | Direct sow |
Growing directions
Surface-sow or barely cover seeds on well-prepared, fine-textured soil; seeds need light and cool temperatures (50–60°F) to germinate — warm soil prevents germination. Plants grow as basal rosettes through winter in mild climates before sending up slender stems topped with large, tissue-paper flowers in spring. Iceland poppies are cool-season plants that stop flowering when summer heat arrives; in cold climates treat them as an early-spring annual with fall-sown or indoor-started transplants set out very early. Harvest cut flowers when buds are just beginning to crack open color and sear stem ends in boiling water to maximize vase life.
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