White Knock Out(R) rose (Rosa 'White Knock Out(R)') brings nonstop, easy color to your garden with bright white blooms that repeat from spring through fall. You can use it as a low hedge, in mass plantings, or as a standout accent where you want reliable flowering without fussy care. Mature size is about 36-48 inches tall and 36-48 inches wide, forming a rounded shrub that fills in quickly without overwhelming nearby plants.
Give your rose full sun for best bloom, but it will also perform in part shade (especially where summers are hot). Plant in well-drained, consistently moist soil and water deeply during dry spells, especially in the first season as roots establish. A 2-3 inch mulch layer helps even out soil moisture and reduces stress during heat and wind.
For a clean, tidy look, lightly prune in late winter or very early spring before new growth takes off. Remove dead or crossing canes and shape the plant to encourage fresh shoots. You can remove spent flowers if you like, but this variety is bred to keep blooming with minimal cleanup, making it a strong choice for busy landscapes.
Space plants so air can move through the canopy, and feed in spring with a balanced rose fertilizer if your soil is lean. With steady sun, water, and a simple pruning routine, you'll get months of white blooms and dark green foliage in a compact, landscape-friendly form.