Suitable for almost any climate, they can be planted as afocal pointor in large groups to form hedges.
Disease-resistant, the roses are self-cleaning, sono deadheadingis needed.
The shrubs do require pruning each year for the best bloom production.
The Spruce / Adrienne Legault
While not suitable as a cut flower, the rose will add interest to your garden for many months.
Knock Out Rose Care
Roseshave a reputation as a plant that requires constant care.
Some cultivars need lots of attention to prevent black spot on the leaves and protection from chilling winds.
The Spruce / Adrienne Legault
Not Knock Out roses.
They can tolerate partial shade but still need at least 6 hours of sunlight to bloom well.
Soil
Thesoilshould be loose loam and well-draining.
The Spruce / Adrienne Legault
Knock Out roses prefer acidic to neutral soils.
Water
As the rose is settling into its new location, it requires frequent watering.
Once established, supplemental watering should be done if the foliage looks wilted or dry.
The Spruce / Adrienne Legault
The plants should not be fertilized until they are established and have completed one bloom cycle.
Fertilize once in the spring by using afertilizer formulated for roses.
Moisten the soil and spread the fertilizer following the label directions.
Knock Out âRadrazzâThe Spruce / Adrienne Legault
Tip
Wearglovesto prevent scratches from the thorns, and be sure your hand shears or pruners aresharpandclean.
This includes planting seeds or propagating bushes from cuttings, even just for growing in your own backyard.
A heavy snow cover helps insulate and protect the plant through the winter.
Knock Out ‘Radral’The Spruce / Adrienne Legault
In the spring, remove the burlap and trim out any dead or broken canes.
Remove any excess mulch.
Then bring the container inside and store it in a cool, dark area.
Blushing Knock OutT.Kiya/Flickr/CC By-SA 2.0
Check periodically and add just enough water so they don’t dry out completely.
Once the threat of frost has passed in the spring, return the containers to their outside location.
Black Spot
Black spotcan appear on the leaves in humid areas.
Knock Out ‘Rainbow’Georgianna Lane / Getty Images
Watering only at the base of the plant will help improve the situation if black spot appears.
It is also a good idea to trim back heavily affected areas.
They are also susceptible to Japanese beetles and rose slugs or sawflies.
Remove the beetles and rose slug larvae by hand andtreat mature rose slugswith insecticides.
Move the plants or prune plants around them so they receive at least 6 hours of sun per day.
Yearly pruning will also produce new canes that produce the most blooms.
If planted and cared for properly with yearly pruning, Knock Out roses can live for decades.
If you want a Knock Out rose as a houseplant, choose the Petite Knock Out Meibenbino.
The mature size is 18 inches tall with non-fading fire engine red blooms.
Be sure it receives at least 8 hours of bright sunlight.
Rosa hybrida Radrazz.NC State Extension Plant Toolbox.
Plant Patent.Cornell Law School.
