Images Depict Mature Plants
Sunny Knock Out® Rose
Rosa 'Radsunny' PP18562, CPBR#4875
Sunny Knock Out® is the rose I point to when someone says, “I just want bright color that behaves.” Those yellow blooms bring instant cheer to a bed, the shrub stays a friendly size for borders and hedges, and it’s built to perform with simple sun-and-water basics. Give it full sun, water at the base, and do one good prune in late winter, and you’ll have months of sunshine in the landscape without the rose drama.
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Sunny Knock Out® Rose for Bright Yellow Blooms and Easy, Season-Long Color
Bright Yellow Flowers That Light Up The Landscape
Sunny Knock Out® Rose brings a cheerful, saturated yellow that reads like sunshine in the garden. It’s the kind of color that makes beds feel warmer and more welcoming—especially near entryways, walkways, and patios where you want a bright, happy focal point. Yellow also plays incredibly well with deep green evergreens, dark mulch, and purple-blue perennials, so it’s easy to build a “designer” color palette around it.
Unlike many older yellow roses, which can look washed out in summer, Sunny Knock Out® is bred to hold its color well in heat. You’ll get fresh blooms in repeated waves, so the plant keeps that bright look instead of fading into the background after one flush. If you’ve been searching for a yellow rose that feels modern, durable, and easy to use in everyday beds, this is a strong pick.
Nonstop Blooming With Low-Fuss Knock Out® Reliability
This rose is built for real-life gardening. Sunny Knock Out® blooms from spring through frost, creating a long season of color that keeps borders and foundation beds looking finished. It’s also valued for the Knock Out® traits gardeners love: strong disease resistance and an overall “plant it and enjoy it” personality that doesn’t demand constant spraying or complicated care routines.
Deadheading isn’t required to keep it blooming, which is a huge advantage if you want a rose that performs even when you’re busy. That said, a quick cleanup of spent clusters can keep the shrub looking extra polished and may encourage faster rebloom. With full sun, proper spacing, and supplemental watering, Sunny Knock Out® stays productive and attractive throughout the season.
A Full Shrub Rose That Works For Borders And Flowering Hedges
Sunny Knock Out® Rose typically matures around 3–4 feet tall and 3–4 feet wide, forming a rounded, well-branched shrub that’s easy to design with. That medium size is perfect for foundation beds and mixed borders where you want a substantial flowering shrub without a towering presence. It’s also excellent when repeated—plant a row, and you get a bold, flowering boundary that stays colorful for months.
For mass plantings, think in groups of three, five, or seven to create a strong block of yellow that reads from the street. In a hedge, the shrub’s naturally dense habit helps it fill in nicely, creating that “soft wall of flowers” look. If you want a bright, low-maintenance hedge that doesn’t feel stiff or formal, Sunny Knock Out® is a great solution plant.
Cleaner Foliage With Sun, Airflow, And Base Watering
Knock Out® roses are known for strong disease resistance, and Sunny Knock Out® performs best when you pair that genetics with simple gardening basics. Plant it in full sun, avoid crowding, and water at the base so leaves dry quickly. Those small choices support cleaner foliage and help the plant keep its energy focused on blooms rather than on stress recovery.
A mulch layer helps stabilize moisture and keeps weeds from stealing resources (keep mulch a few inches away from the base). Then all you really need is a yearly late-winter prune to refresh the plant and encourage new bloom-producing growth. With sun, spacing, and one good prune, Sunny Knock Out® stays dense, bright, and reliably blooming year after year.
| Hardiness Zone: | 4-10 |
|---|---|
| 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; bright yellow blooms |
| Soil Condition: | Well-drained soil; improves with compost at planting |
| Water | Medium; deep water to establish, then water during dry spells |
| Wildlife Value | Blooms attract bees and beneficial pollinators |
| Resistance | Strong disease resistance; not reliably deer resistant; moderate drought tolerance once established |
| Landscape Uses | Borders, mass plantings, foundation beds, flowering hedge, walkway edging, containers |
How to Care for Sunny Knock Out® Rose
Be sure to read our planting instructions to ensure a healthy and happy Sunny Knock Out® Rose plant for years to come!
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How should I plant Sunny Knock Out® Rose?
Plant Sunny 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 root area to conserve moisture and reduce weeds, keeping mulch a few inches away from the base of the plant. If your soil drains slowly, plant slightly high or improve drainage before planting. A sunny, well-drained start is the quickest path to stronger growth and heavier bloom cycles.
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How often should I water Sunny 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. After it’s established, water during extended dry spells and during heavy bloom periods for best performance. Water at the base rather than overhead so foliage stays drier. Deep, less-frequent watering encourages stronger roots and better resilience.
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When should I fertilize Sunny Knock Out® Rose?
Fertilize in early spring as new growth begins using a rose fertilizer or balanced slow-release fertilizer. Apply it over the root zone (not against the stems) and water afterward so nutrients move into the soil where feeder roots can absorb them. If you want extra bloom power, feed again after the first major bloom flush. Avoid heavy late-season fertilizing, which can push tender growth when the plant should be slowing down. Consistent, moderate feeding supports better bloom cycles and sturdier branching.
When and how should I prune Sunny Knock Out® Rose?
Prune Sunny 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 a healthy framework to refresh its shape and encourage vigorous new bloom-producing growth. During the season, you can lightly trim straggly growth to keep the shrub tidy, but avoid heavy pruning in extreme heat. Deadheading isn’t required, though a quick cleanup of spent clusters can keep it looking extra polished. A simple yearly prune is usually all it needs to stay dense and bloom-packed.
