Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Bearded Iris — Growing reference
| Scientific name | Iris germanica |
|---|---|
| First harvest or flowering (days) | 270–365 |
| Measured from | Transplant |
| Plant spacing (cm) | 30.5–45.7 |
| Mature height (cm) | 61–91.4 |
| Mature spread (cm) | 45.7–61 |
| USDA hardiness zones | 3–9 |
| Light | Full sun |
| Water | Low |
| Sowing method | Division |
Growing directions
Set rhizomes horizontally with the top surface exposed to the sun — never bury them, as iris borers and rot thrive under covered rhizomes. Plant in late summer after bloom, with the fan of leaves pointing in the direction you want growth to spread. Divide every 3–4 years when clumps become overcrowded, discarding the woody center and replanting healthy outer fans. Good drainage is essential; soggy soil causes rhizome rot.
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