Climate matters. This page is a practical baseline. Confirm cultivar, local frost/heat conditions, mature size and regional restrictions before planting.
Astilbe — Growing reference
| Scientific name | Astilbe x arendsii |
|---|---|
| Seed germination (days) | 21–28 |
| Soil temperature for germination (°C) | 18.3–21.1 |
| First harvest or flowering (days) | 90–120 |
| Measured from | Transplant |
| Plant spacing (cm) | 45.7–61 |
| Mature height (cm) | 30.5–121.9 |
| Mature spread (cm) | 45.7–91.4 |
| USDA hardiness zones | 4–9 |
| Light | Partial sun |
| Water | High |
| Sowing method | Division |
Growing directions
Plant crowns so the top of the rhizome sits 1–2 in below the soil surface in consistently moist, humus-rich soil — astilbe does not tolerate drought and will brown and decline quickly without adequate moisture. The feathery plumes in shades from white through pink to deep red are spectacular in shade and semi-shade gardens from late spring through summer. Leave the russet dried plumes standing through fall and winter for ornamental interest. Divide every 3–4 years in spring when flowering declines or the crown heaves above the soil surface.
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