Overview
Double Knock Out Rose is a repeat-flowering landscape rose with full cherry-red blooms and good disease resistance. In Central Florida it can bloom much of the year and usually forms a 3- to 4-foot rounded shrub.
Mature Size and Habit
It develops a dense, branching mound and grows quickly in warm weather. Leave working room around each plant rather than packing it beneath windows or beside pedestrian paths.
Best Landscape Uses
Use it in sunny borders, foundation beds, low flowering hedges, entry gardens, and large containers. Groups create a stronger color display and simplify irrigation and pruning.
Sunlight
Provide at least six hours of direct sun. Morning sun dries foliage and helps reduce disease pressure. Shade produces longer stems, fewer flowers, and a more open plant.
Soil, Drainage, and Irrigation
Plant in fertile, well-drained soil. Water deeply at the root zone during establishment and drought. Avoid frequent overhead irrigation, and keep mulch from covering the crown.
Best Planting Season for Tampa and Central Florida
October through March is ideal because roots establish in mild weather. Early spring also supports fast growth. Avoid transplanting in extreme heat unless irrigation is closely managed.
Pruning and Maintenance
Cut back in late winter before strong spring growth. Remove dead, crossing, or weak stems and sanitize tools. Watch for chilli thrips, mites, black spot, and rose rosette symptoms.
Wildlife Value
The densely doubled flowers offer less accessible pollen than single roses, so wildlife value is limited. Bees can still visit open blooms, and branching gives minor cover.
Cold and Heat Sensitivity
It handles Tampa heat with consistent root moisture and mulch. Frost can damage flowers and tender shoots, though established plants usually recover. Reflected pavement heat raises summer stress.
Safety, Roots, and Placement Warnings
Stems have thorns. Set plants back from walks, pools, play areas, and service gates. Roots are not considered aggressive, but open soil is preferable to a narrow pavement pocket.
Invasive Concerns
Double Knock Out Rose is not considered invasive in Florida. Remove unwanted suckers and discard diseased material away from healthy roses.
Helpful Resources
See UF/IFAS Knock Out Roses and the official cultivar profile.