Knock Out Roses Size

Flower Size

• The individual flowers on Knock Out roses are 2 to 3 inches wide and grow in clusters, like a small bouquet. All the Knock Out roses are self-cleaning, meaning it's not necessary to deadhead the shrubs. Flowers are produced in cycles, with a large flush of bloom every five or six weeks. There is lighter flowering in between the heavy flushes.

Shrub Size

• With the exception of the "Sunny" Knock Out rose, all varieties of Knock Out roses grow 3 to 4 feet high and wide if pruned as the grower suggests. Unpruned bushes grow larger, as do bushes grown in areas with very long growing seasons. To control their size during the growing season, prune the shrubs back immediately after a heavy flowering cycle.

The Sunny Knock Out Rose

• The newest introduction to the Knock Out line, the Sunny Knock Out rose grows more upright than the other Knock Out roses, reaching 3 to 5 feet tall and 3 to 4 feet wide. The Sunny Knock Out rose has bright yellow flowers that fade to cream. As with all Knock Out roses, it's hardy in USDA Zone 5 through Zone 11. It's the only member of the Knock Out rose family that's fragrant.

Pruning

• The developer of Knock Out roses, Conard-Pyle, suggests pruning the shrubs back to 12 to 18 inches above the ground in the early spring, both to control size and to encourage maximum flower production. If additional pruning is desired during the growing season, do so immediately after a heavy flowering cycle. To discourage disease, prune away broken branches whenever they're found, regardless of the season. Deadheading is not necessary.