Knockout Roses are a family of roses that are extremely popular because of how easy they are to grow. They are known for their drought tolerance and disease resistance, and they have gorgeous blooms.
History
Knockout Roses were created by Bill Radler, a rose breeder. This breed of roses won him the All-American Rose Selection award or AARS award in 2000.
Features
The Knockout Rose will add color to your landscape through its magnificent blooms from early spring and well into the frosts of winter.
Geography
They can be planted up to USDA plant zone 5, and they tolerate heat well. You can plant them in groups of three to five or singly among your annuals and perennials.
Considerations
If you do not prune the Knockout Rose it will reach a size of 3' - 4' tall and 3' - 4' in width. (Although they can be trimmed to maintain a smaller height.)
Care
It is recommended that you prune them to half their size once a year (late winter or early spring) as this will increase their growth.
Source: http://www.ehow.com/facts_5008411_history-knockout-roses.html
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