Use and Care Manual

Knockout Rose
Rosa ‘Radrazz’
KNOCK OUT is a compact shrub rose that typically grows to 3-4’ tall and as wide. It is best noted for its ability to bloom in
as little as 3 hours per day of direct sun with excellent disease resistance. Features single, lightly fragrant, cherry-red roses
to 3.5” diameter that bloom in clusters from May to frost. Flowers are followed by orange-red hips. Foliage is dark purplish
green in summer, turning purple to burgundy in fall. 2000 AARS winner.
Hardiness Zones
USDA Hardiness Zones 5-9.
Sun Exposure/Watering
Full sun to partial shade
Mature Plant Size
3-4’ High by 3-4’ Wide
Bloom Period
Early Summer to frost
Growing Tips
Best grown in medium moisture, slightly acidic, well-drained garden loams in full sun to part shade. Best flowering and
disease resistance generally occur in full sun, however. Water deeply and regularly (mornings are best). Avoid overhead
watering. Good air circulation promotes vigorous and healthy growth and helps control foliar diseases. Summer mulch
helps retain moisture, keeps roots cool and discourages weeds. Remove spent flowers to encourage rebloom. Crowns need
winter protection in cold winter areas such as St. Louis. Remove and destroy diseased leaves from plants, as practicable,
and clean up and destroy dead leaves from the ground around the plants both during the growing season and as part of a
thorough cleanup during winter (dormant season). Prune as needed in late winter to early spring.
KNOCK OUT will grow very well in part shade locations with excellent disease resistance.
Pests & Problems
Excellent disease resistance. Potential insect problems include aphids, beetles, borers, scale, thrips, rose midges,
leafhoppers and spider mites.