Knock Out vs Double Knock Out rose
The same rose in almost every way: the same size, the same resistance to black spot, the same flushes of flower from late spring to frost with no deadheading. The difference is the flower. The original 'Knock Out' has open, nearly single flowers that bees can get into; 'Double Knock Out', a later rose from the same breeder, has fully double flowers like a small florist's rose, which look fuller from a distance.
| Shrub rose 'Knock Out' Rosa 'Knock Out' |  Rose 'Double Knock Out'Rosa 'Radtko' (Double Knock Out) | |
|---|---|---|
| Size | 4 ft tall, 4 ft wide | 4 ft tall, 4 ft wide |
| Plant | 3½ ft apart | 3½ ft apart |
| Zones | 5 to 9 | 5 to 9 |
| Light | Full sun | Full sun |
| Soil | Well-drained, average fertility | Well-drained, average fertility |
| Flowers | Late May to mid October; red, pink | Late May to mid October; red |
| Leaves | Medium, deciduous | Medium, deciduous |
| Job in a bed | Anchor | Anchor |
| Pets | No toxicity recorded | No toxicity recorded |
| Deer | No record | No record |
| Native | No | No |
| Spread | Low risk | Low risk |
Rows where they differ are marked. Flowering times are for zone 5.
Which to choose
- On the record they are near twins: choose by the look you want.
Can they grow together?
Yes: they grow in the same conditions. What rose 'Double Knock Out' brings beside shrub rose 'Knock Out': in flower together for 21 weeks, from late May. They share full sun and zones 5 to 9.
Read more: all about shrub rose 'Knock Out', and all about rose 'Double Knock Out', each with a bed the planner designed around it.