Images Depict Mature Plants
Red Knock Out® Rose
Rosa 'Radrazz' PP11836, CPBR#0993
If you want one rose that makes you feel like you’ve got the whole garden under control, Red Knock Out® is it. It’s the classic cherry-red color people picture when they say “I want roses,” but it behaves like a reliable landscape shrub—repeat blooms for months, strong disease resistance, and self-cleaning flowers that don’t demand constant deadheading. Give it full sun, water at the base, and do one good prune before spring growth takes off, and you’ll get that long-season color without the rose drama.
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Red Knock Out® Rose for Cherry-Red Color, Easy Care, and Season-Long Blooms
Cherry-Red Blooms That Keep Your Beds Bright For Months
Red Knock Out® Rose is famous for one big reason: it keeps flowering when many shrubs take a break. You get bright cherry-red blooms in repeated waves from spring through frost, so borders and foundation beds don’t “go quiet” after one early-season show. The color reads clearly from the street, and up close it feels cheerful and classic—perfect for gardeners who want a true red rose look without a high-maintenance routine.
Because the flowers arrive in clusters, the plant looks full and colorful even from a distance. Use it as a focal point near an entry, repeat it along a walkway for rhythm, or mass it in a sunny bed for that “professionally landscaped” sweep of red. Pair it with deep green evergreens, ornamental grasses, and white or purple perennials to make the red pop even more.
Low-Maintenance, Self-Cleaning Flowers With Strong Disease Resistance
This is the rose that changed how people landscape with roses. Red Knock Out® is known for strong disease resistance and an easy-care habit that fits busy schedules. The flowers are self-cleaning, which means you don’t have to deadhead constantly to keep the plant blooming. If you like a super-tidy look, you can snip spent clusters occasionally, but it’s not required for repeat bloom.
For best results, give it full sun and water at the base to keep the foliage drier. Those two basics—sun plus base watering—go a long way toward keeping leaves looking clean and glossy through the season. Add a simple mulch ring (kept off the stems) to stabilize moisture, and you’ve got a rose that rewards you with consistent color and fewer headaches.
A Compact, Rounded Shrub That’s Perfect For Borders And Hedges
Red Knock Out® Rose typically matures around 3–4 feet tall and 3–4 feet wide, forming a rounded, bushy shrub that fits easily into most landscapes. That medium size makes it incredibly flexible: it’s substantial enough to anchor a bed, but not so large as to overwhelm smaller spaces. Plant one as a specimen for a reliable “bloom engine,” or plant several for a bigger block of color that looks intentional and cohesive.
It’s also a terrific flowering hedge rose. A row of Red Knock Out® creates a soft boundary that blooms for months and feels more welcoming than a rigid evergreen line. When spaced correctly, plants fill in without crowding, supporting airflow and keeping maintenance simple. This is an ideal choice when you want a long-blooming hedge with a friendly, approachable look.
Simple Pruning And Sunlight Keep It Blooming Like A Pro
Pruning Red Knock Out® is straightforward. A late-winter or early-spring prune refreshes the shrub, encourages vigorous new growth, and sets you up for heavier bloom cycles. You don’t need complicated rose techniques—just remove dead or damaged stems, thin a little for airflow, and shape the plant back into a rounded form. That fresh growth is where the plant produces its best flowers.
Throughout the season, light shaping is optional if you want to keep the shrub extra tidy, but the main “must-do” is that once-a-year pruning refresh. Combine that with full sun, well-drained soil, and deep watering during establishment, and you’ll have a dependable landscape rose that looks great for months with a maintenance routine that’s easy to repeat year after year.
| Hardiness Zone: | 5-11 |
|---|---|
| Mature Height: | 3 to 4 Feet |
| Mature Width: | 3 to 4 Feet |
| Sunlight: | Full sun (best); tolerates light partial sun |
| Bloom Time / Color | Spring to frost; cherry-red blooms |
| Soil Condition: | Well-drained soil; adapts well with compost at planting |
| Water Requirements: | Medium; deep water to establish, then water during dry spells |
| Wildlife Value | Blooms can attract bees and beneficial pollinators |
| Resistance | Strong disease resistance; self-cleaning blooms; moderate drought tolerance once established; not reliably deer resistant |
| Landscape Uses | Borders, mass plantings, foundation beds, low flowering hedge, walkway/driveway lines, containers |
How to Care for Red Knock Out® Rose
Be sure to read our planting instructions to ensure a healthy and happy Red Knock Out® Rose plant for years to come!
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How should I plant Red Knock Out® Rose?
Plant Red Knock Out® Rose in full sun in well-drained soil. Dig a hole about twice as wide as the root ball and set the plant so the top of the root ball sits level with the surrounding soil. Backfill with native soil, water deeply to settle, and create a shallow watering ring to guide water into the root zone. Mulch 2–3 inches over the planting area to conserve moisture and reduce weeds, keeping mulch a few inches away from the base of the stems. If your soil drains slowly, plant slightly high or improve drainage before planting. A sunny, well-drained start is the fastest path to stronger growth and heavier bloom cycles.
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How often should I water Red Knock Out® Rose after planting?
Water deeply right after planting, then keep the root zone evenly moist (not soggy) for the first several weeks. A good baseline is a deep soak about once per week, increasing to twice per week during hot weather, sandy soil, or windy conditions. As it establishes over the first season, continue deep watering during dry spells so roots grow down and out. Once established, it becomes more drought-tolerant, but it blooms best with occasional deep watering during extended heat. Water at the base rather than overhead to help foliage stay cleaner.
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When should I fertilize Red Knock Out® Rose?
Fertilize in early spring as new growth begins using a balanced slow-release fertilizer or a rose-specific fertilizer. Apply it over the root zone (not against the stems) and water afterward so nutrients move into the soil where feeder roots can access them. If you want extra bloom power, feed again after the first major flush of blooms. Avoid heavy late-season fertilizing, which can push tender growth when the plant should be slowing down. Consistent, moderate feeding supports steady bloom cycles without turning the plant into a maintenance project.
When and how should I prune Red Knock Out® Rose?
Prune Red Knock Out® Rose in late winter or early spring before active growth begins. Remove dead or damaged stems first, then cut the plant back to refresh its shape and encourage vigorous new bloom-producing growth. To keep the shrub full, avoid only “shearing the outside.” Instead, thin a little crowded growth from the center for airflow and shape the overall mound. Deadheading isn’t required, but occasional cleanup can keep it looking extra polished. One good yearly prune is usually all it needs.
