Commercially available

• Knockout
• Purple Meidiland
• RADrazz

20 favorite votes.  
EXCELLENT- overall member rating.  

Red blend Shrub.

Bred by William J. Radler (United States, 1999).
Introduced in United States by Conard-Pyle (Star Roses) in 2000.
Introduced in France by Selection Meilland in 2001.

Shrub.  Earth Kind ™.  

Bright, florescent cherry red.  Mild, spice, tea fragrance.  7 to 13 petals.  Average diameter 3.5".  Single to semi-double, cluster-flowered bloom form.  Blooms in flushes throughout the season.  Decorative buds.  

Bushy, compact, rounded.  Glossy, dark green foliage.  
Height of 2' to 4' (60 to 120 cm).  Width of 3' to 4' (90 to 120 cm).

USDA zone 4b through 9b.  Used for landscape.  Very hardy.  vigorous.  shade tolerant.  Disease susceptibility: very blackspot resistant., susceptible to Mildew.  Requires spring freeze protection (see glossary - Spring freeze protection) .  Can be grown in the ground or in a container (container requires winter protection).  

United States - Patent No: PP 11,836  on  10 Apr 2001   VIEW USPTO PATENT
Application No: US1999000229323  on  13 Jan 1999
Shrub rose plant named `Radrazz'.
William J. Radler, Greenfield, Wisconsin
... a landscape shrub rose... single blossoms that are red... Excellent disease resistance to blackspot is exhibited...
The female parent (i.e., the seed parent) was a seedling of the `Carefree Beauty` variety (U.S. Plant Pat. No. 4,225). The male parent (i.e., the pollen parent) of the new variety was a seedling of the `Razzle Dazzle` variety (U.S. Plant Pat. No. 3,995)... The blooming cycle is believed to be one of the longest observed to date for a rose plant...

Triploid

In his garden in Tyler, Texas, Mark Chamblee, of Chamblee's Rose Nursery, grows 'Belinda's Dream', 'Marie Daly', 'Marie Pavie', 'Livin' Easy', 'Easy Going', 'Knockout', and 'Mermaid'. Mark likes these varieties because "they have great hardiness and disease resistance, they are low maintenance and are very free blooming." [From A Year of Roses, by Stephen Scanniello, pp. 146-147:] Tree roses, also called standard roses, are often displayed to their best advantage when planted in containers... Tree roses come in heights anywhere from two feet high (most common with miniature roses) to over six feet. There are two forms of standard roses available. One if the common form of a long stem supporting a bushy display of roses, sort of like a large lollipop. The other is a weeping standard, the only style I think worth using.

Tree roses are created by attaching three buds of a rose cultivar to a long straight stem of another rose. The most common stem stock to use is an unnamed rugosa rose variety. Other roses have been used for creating standards, but the rugosa seems to be the strongest, surviving the longest.