'Double Red Knockout' Rose
Rosa 'Radtko'
Flower: Full double red flowers throughout
summer and fall. The 'Double Red Knockout' Rose is almost always in
bloom. It seems to have a shorter period of rest between heavy
flowering times than 'Knockout'.
Size: 3-4' in height and 3-4' in width. This variety is a vigorous grower and could grow more than 4 feet if it is unpruned. Very fast growing in the spring.
Foliage Color: Dark green with reddish-purple new growth. Very nice and clean. Vigorous growth can be expected. Very nice purplish fall color.
Hardiness Zones: 5-9. Double Red 'Knock Out' Roses perform well in most of the US.
Light Requirement: Performs great in both full sun to part-shade. Better growth and flower production in the sun.
Drought Tolerance: Moderate, prefers moist well-drained soil. Summer watering of 'Knockout' Roses keeps them blooming heavily.
Notes: This is a patented variety and propagation is prohibited. Hybridized by William Radler and introduced by Conard-Pyle Co. and Star Roses. Very disease resistant. Many new hybrids don't live up to the hype, but this one exceeds it. Re-blooms every 3-5 weeks. Very widely available. This variety should surpass sales of 'Knockout', because the foliage and flowers are nicer. Best selling shrub in the trade.