Without a doubt Bill Radler has revolutionized the concept of what great garden roses should be, hardy, disease-free and floriferous, with the development of the Knock Out rose. Many gardeners concur that he single-handedly brought rose genetics from the 20th-century into the 21st-century. ‘Knock Out’, Bill Radler's first commercial rose breeding success and a 2000 AARS winner, has broken all records for sales of a new rose.
Background of the Knock Out Rose:
Out rose was developed by long-time
In 1988, Radler crossed seedlings of Carefree Beauty and Razzle Dazzle, both hardy roses with good disease resistance. In 1992, the Conard-Pyle Company / Star Roses began testing the plant. In 2000, it won the prestigious All-America Rose award, and the company introduced it that same year. Knock Out quickly became the fastest selling new rose in history, with 250,000 sold the first year alone. William Radler has continued his efforts and work on the Knock Out rose developing new sister varieties that include: Double Knockout, Double Pink Knock Out, Sunny Knock Out and Rainbow Knockout.
Appearance of the Knock Out Rose:
Knock Out (PP 11,836 cut. ‘Radars’) is a shrub rose that grows about 3 feet tall and wide. It produces terminal clusters of single, 3-inch diameter cherry red blooms. As long as it continues to grow through the summer, it will continue to bloom. Some claim it’s one of the longest blooming roses on the market. It’s not well suited for use as a cut flower and the blooms only have a light tea rose fragrance. Forget about ever having to care for this rose with its bullet-proof foliage that completely repels Blackspot and mildew and its compact shape that only requires an annual trim to stay neat and clean. Periodic dead-heading of spent blooms will encourage this prolific bloomer to continue providing you with a colorful show all season long.
Uses for Knock Out Roses:
Knock Out Roses really shine when used as flowering hedges, foundation plants in perennial beds and borders, in a large patio container or adjacent to an entryway. The compact shape and form of the Knock Out rose works well with ornamental grasses, evergreens and other ornamental plants. Our nursery is located in a USDA zone 5b gardening zone and we have had Knock Out roses blooming well into November!
Since the original Knock Rose, William Radler has continued to develop new and exciting sister selections including: