Side-by-side plant comparison — which is right for your garden?
Astilbe × arendsii
Saxifragaceae · flowers
Rosa 'Radrazz'
Rosaceae · flowers
Astilbe (Zones 4-8)
Knockout Rose (Zones 5-10)
Overlap: Both grow in zones 5–8
| Feature | Astilbe | Knockout Rose |
|---|---|---|
| Scientific Name | Astilbe × arendsii | Rosa 'Radrazz' |
| Family | Saxifragaceae | Rosaceae |
| Category | flowers | flowers |
| Sun | ⛅ Part Shade | ☀️ Full Sun |
| Water | 💧💧 Medium to High | 💧💧 Medium |
| Soil | Rich, Moist | Well-drained |
| Height | 3' | 4' |
| Spread | 2' | 4' |
| Bloom Season | Summer | Spring-Fall |
| Bloom Color | Red, Pink, White, Purple | Red, Pink |
| Growth Rate | Medium | Fast |
| Native Region | East Asia | Hybrid (US) |
| Maintenance | Low | Low |
Astilbe
Knockout Rose
Astilbe
Knockout Rose
Choose Astilbe if you want a low-maintenance plant, and want deer resistance. It thrives in part shade with medium to high water in zones 4–8.
Choose Knockout Rose if you want a low-maintenance plant, need drought tolerance. It thrives in full sun with medium water in zones 5–10.
Plant them together? Both overlap in zones 5–8. However, they have different sun needs, so plan your garden layout carefully.
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