Knockout Rose is a perennial grown for its blooms, which open in spring and return year after year. It's hardy across USDA zones 5 through 11. Its spring flowers are a moderate draw for honeybees and native bees.
Knockout Rose — the short answer
Knockout Rose: grown in zones 5–11, part sun.
- USDA zones
- 5–11
- Manual horticultural correction (source not retained); NC State Extension and Missouri Botanical Garden, with the remaining rows from other published sources or Growable Ground compilation
- Sun
- Part Sun
- Growable Ground Plant Database
Plant data: Growable Ground Plant Database, compiled from FAO ECOCROP, USDA PLANTS and university Extension sources — each tile names its own row's source, because per-field provenance varies.
Which pests actually threaten knockout rose where you grow?
Japanese beetle is only documented in part of the country, so the answer depends on where you plant. Enter your location and we'll tell you which one reaches your land — and the move that beats it.
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What Knockout Rose is
Knockout Rose grows as a perennial and reaches around four feet at maturity. It blooms in spring.
How to grow Knockout Rose
Knockout Rose grows in USDA zones 5 through 11. Knockout Rose does best in part sun — at least 4 hours of direct sun a day, on well-drained ground. It needs about 200 hours of winter chill, which is why climate matters as much as soil.
USDA Zones
5-11
USDA PHZM 2023
Soil pH
Data pending
Sun
Part Sun
Growable Ground plant catalog
Drainage
well (dry spells)
Growable Ground plant catalog
Mature Height
4 ft
Growable Ground plant catalog
Chill Hours
200+
Winter hours below ~45°F it needs to fruit — too-mild winters can leave it bloom-shy.
Growable Ground plant catalog
Frost-Free Days
0+
The frost-free stretch it needs start to finish — short-season areas may need an indoor head start.
Growable Ground plant catalog
Start the season right
Plant knockout rose in part sun with at least 4 hours of direct sun.
Match the soil
Pull a soil test from your local Extension lab to confirm pH and drainage match knockout rose's needs before planting.
Water steadily
Keep the root zone evenly moist through establishment. A 2–3 inch mulch layer holds moisture without waterlogging.
Harvest at its peak
Cut knockout rose blooms in the cool of the morning, just as they open, for the longest display.
Where Knockout Rose thrives
Knockout Rose is hardy across USDA zones 5 through 11. Zone is only the starting point, though: the soil pH, drainage, and frost dates on your specific land decide how well it actually does.
A USDA zone is a 10°F band of average annual extreme winter minimum, so zones 5–11 spans average winter lows from -20°F to 50°F (USDA PHZM 2023). Across the 50 states and DC, that band covers 29 outright and splits 21 more down the middle — and which side of that line your land sits on changes the answer.
Zones 5–11·Where Knockout Rose growsOpen map →
Where Knockout Rose stands, state by state
Knockout Rose is rated for zones 5–11 — a cold floor USDA puts at -20 to -10°F. Across the 50 states and DC, 29 sit fully inside that band, the line runs through 21 more, and 1 sits outside it — and inside every split state, the same line runs on at county grain.
Fully inside zones 5–11
29 states
3 of 29 shown
The line runs through
21 states
3 of 21 shown
Knockout Rose’s band covers part of each of these states — which side of the line your county sits on changes the answer, and each state page draws it.
Outside zones 5–11
1 state
- North Dakota · zones 3b-4b
Winter cold is the limit here — the same plant often works in a container that comes under cover. Each link is that state’s own growing hub.
State zone extents: USDA Plant Hardiness Zone Map (PHZM) 2023. A zone is a 10°F band of average annual extreme minimum temperature, so a state that splits the band contains the boundary — its own page draws the county line, and a parcel report resolves which side your land sits on.
What grows around Knockout Rose
Growing guides for knockout rose
In rotation planning, knockout rose counts as a Other — beds recover best when other crops don’t follow each other in the same spot year over year. (Growable Ground derivation — crop-rotation group from botanical family)
Good to know
Good news for pet owners — knockout rose isn't known to be toxic to dogs or cats. (Source: ASPCA.)
Knockout Rose offers moderate value to bees and other pollinators. (Source: Pollinator Partnership.)
Your land is one point inside Knockout Rose's range
This page resolves to the species. Your state page draws the county line, and a report reads the parcel — the soil pH, drainage, sun, and frost dates on your exact ground, which no species average can see.
See if Knockout Rose will thrive on your land
Zone averages are a start. Your exact soil pH, drainage, sun exposure, and frost dates shape whether knockout rose actually takes — we score it against the real conditions at your address.
Three things about your exact spot that zone averages miss:
We read public map data for this spot — soil, climate, flood, and parcel records. How we handle your address.
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How we know this about Knockout Rose
The figures above are cited per row, not per site: the pH band names this plant’s own source column, the three temperature figures each carry their own, and days-to-maturity cites the publication that actually lists it. All of it comes from the Growable Ground Plant Database — a compilation over FAO ECOCROP, USDA PLANTS, and university Extension sources, published openly with per-field provenance.
Grounded inUSDA PLANTS Database•USDA PHZM•ASPCA
Frequently asked questions
Can I grow Knockout Rose in my zone?
Knockout Rose grows in USDA hardiness zones 5 through 11 (USDA PHZM 2023). Zone is one factor — soil pH, drainage, and frost dates on your specific parcel also shape whether it takes.
When should you plant Knockout Rose?
Time knockout rose to your own season rather than the calendar. Your local frost dates set the exact window — a Growable Ground report reads them for your address.
How much sun does Knockout Rose need?
Knockout Rose does well in partial sun — around 4 hours of direct sun, and it takes some afternoon shade in stride. That flexibility makes it a good match for a bed the house or a nearby tree shades for part of the day. A Growable Ground report maps how the sun actually falls on your land, hour by hour, so you can set it where the light lines up.
What soil does Knockout Rose need?
Specific pH data for knockout rose is pending. It prefers well-drained ground. A soil test from your local Extension lab confirms what your site needs.
Does Knockout Rose attract pollinators?
Yes — knockout rose's flowers are a solid nectar source for honeybees and native bees. (Source: Pollinator Partnership.)
Is Knockout Rose safe for pets?
Knockout Rose is not known to be toxic to dogs or cats based on available data. Always supervise pets around new plantings. (Source: ASPCA.)