shrub
Shrub rose 'Knock Out'
Rosa 'Radrazz'
Preview: plant data is awaiting horticulturist review. A professional horticulturist hasn't reviewed our plant table yet. Lists still follow fixed rules for zone, sun, pets, deer and invasive status.
Shrub rose 'Knock Out' is a fast-growing deciduous shrub hardy in zones 5–10. Expect 3–4 ft of height and 3–4 ft of spread; our lists space it 3 ft apart. It does best in full sun with average water. Expect red flowers in May to October. In a FloraVista list it usually plays the structure role: a shrub that holds the bed's shape at the back all year. Deer do eat it, and it is not listed as toxic to dogs or cats.
Facts from our plant table
- Botanical name
- Rosa 'Radrazz'
- Plant type
- Shrub, deciduous
- Hardiness zones
- 5 to 10
- Sun
- Full sun (6+ hours)
- Water
- Medium
- Mature size
- 3–4 ft tall × 3–4 ft wide
- Spacing
- 3 ft apart (centre to centre)
- Growth rate
- Fast
- Bloom
- May–Oct · red
- Roles in a bed
- Structure
- Styles
- cottage, classic
- Deer resistance
- Low: deer eat it
- Pets
- Not listed as toxic to dogs or cats. Rose is listed non-toxic to dogs and cats by the ASPCA; thorns can scratch.
- Native to
- Not native to the US (or a garden hybrid)
- Pot size and price
- 3-gallon pot, typically $25–$40 (easy to find)
- Plant in
- Spring or Fall
- First-year watering
- Water deeply once or twice a week through the first summer, more in heat waves, so the root ball never dries out.
- Pruning
- Cut back by a third to a half in late winter; remove any plant showing rose rosette.
Sources: Missouri Botanical Garden Plant Finder; ASPCA toxic and non-toxic plant list; Rutgers NJAES deer resistance ratings (A-D); state noxious weed lists / Invasive Plant Atlas of the US; typical 2026 US garden-centre and big-box listings. Not yet reviewed by a horticulturist.
Guides that include this plant
- Dog-safe plants for a full-sun bed in zone 5 (as a substitute)
- Dog-safe plants for a full-sun bed in zone 7 (as a substitute)
- Dog-safe plants for a full-sun bed in zone 8 (as a substitute)
- What to plant in a full-sun bed in zone 5 (as a substitute)
- What to plant in a full-sun bed in zone 8 (as a substitute)
- Cottage garden plants for a sunny bed in zone 5 (as a substitute)
- Cottage garden plants for a sunny bed in zone 7 (as a substitute)
- Cottage garden plants for a sunny bed in zone 8 (as a substitute)
Good companions
The plants our list engine most often puts in the same bed as Shrub rose 'Knock Out', across the sun, zone, pet, deer and style combinations it fits.
- Dwarf fountain grass 'Hameln'Pennisetum alopecuroides 'Hameln'ornamental grass · zones 5–9
- Stonecrop 'Autumn Joy'Hylotelephium 'Herbstfreude'succulent · zones 3–9
- Lamb's ear 'Helen von Stein'Stachys byzantina 'Helen von Stein'perennial · zones 4–8
- Spike speedwell 'Royal Candles'Veronica spicata 'Royal Candles'perennial · zones 3–8
- Garden phlox 'David'Phlox paniculata 'David'perennial · zones 4–8
- Pink muhly grassMuhlenbergia capillarisornamental grass · zones 6–11
If you can't find it
Substitutes our engine offers for Shrub rose 'Knock Out': same role in the bed, passing the same rules.
- Weigela 'Wine & Roses'Weigela florida 'Alexandra'zones 4–8 · not flagged toxic to pets
- Dwarf Korean lilac 'Palibin'Syringa meyeri 'Palibin'zones 3–7 · not flagged toxic to pets
- Summersweet 'Hummingbird'Clethra alnifolia 'Hummingbird'zones 4–9 · not flagged toxic to pets
- Shrubby cinquefoil (potentilla) 'Goldfinger'Dasiphora fruticosa 'Goldfinger'zones 2–7 · not flagged toxic to pets
How this page was made
This page was generated from this plant's record in FloraVista's plant table by fixed rules. The companions and substitutes come from the lists our rules engine composes. No named expert has reviewed this page.
Data status: the plant table is awaiting review by a horticulturist. Check each plant with a local nursery or extension office before you buy.
Sources
- Missouri Botanical Garden Plant Finder, state extension services and the USDA PLANTS database (zones, size, sun, water, bloom, native range)
- ASPCA toxic and non-toxic plant lists (dog and cat toxicity)
- Rutgers NJAES and regional extension deer-resistance ratings
- State noxious-weed and invasive-plant lists and the Invasive Plant Atlas of the US
- Typical US garden-centre listings (pot size and price band)
Generated . How FloraVista chooses plants