Plant field guide
Knockout Rose (Sunny Yellow)
The yellow member of the famous Knockout Rose family — bringing warm, sunny color to landscapes where other yellow roses struggle with disease. Same extraordinary resilience and continuous bloom cycle in a fresh golden tone.
Growing requirements
- Scientific name
- Rosa x 'Radsunny'
- Sun
- full sun
- Water
- moderate
- Height
- 36 in (91 cm) – 48 in (122 cm)
- Spread
- 36 in (91 cm) – 48 in (122 cm)
- Spacing
- 36 in (91 cm)
- Hardiness zones & minimum temperature
- USDA 5–9; average annual extreme minimum from -20°F (-28.9°C). Hardiness does not predict local frost dates.
- Difficulty
- easy
Planting & seasonal timing
Northern Hemisphere planting months: not yet verified in our database.
Northern Hemisphere pruning months: February, March.
For the Southern Hemisphere, these seasonal windows shift approximately six months. Check your local frost forecast, soil temperature, and species requirements; calendar months are not a guarantee of planting safety.
Same exceptional care-free culture as other Knockout roses. Yellow fades to creamy white in heat — most vibrant in spring and fall. Self-cleaning, continuous bloomer. Hard prune in late winter.
Pruning
Cut back hard to 12–18 inches in late winter. Minimal deadheading required.
Fertilizer
Rose fertilizer or balanced slow-release
Early spring and monthly through summer
Mulch
3–4 inches organic mulch.