Knockout Rose is a perennial grown for its blooms, which open in spring and return year after year. Its spring flowers are a moderate draw for honeybees and native bees.
Zones
Data not available
pH Range
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Sun
Part Sun
Days to Maturity
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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 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
Data not available
USDA PHZM 2023
Soil pH
Data pending
USDA PLANTS Database
Sun
Part Sun
plant_species_v5.csv
Drainage
well (dry spells)
plant_species_v5.csv
Mature Height
4 ft
plant_species_v5.csv
Chill Hours
200+
plant_species_v5.csv
Frost-Free Days
0+
plant_species_v5.csv
Start the season right
Plant knockout rose in part sun with at least 4 hours of direct sun, once the soil has warmed and frost risk has passed.
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.
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: Xerces Society, Pollinator Partnership.)
Where Knockout Rose thrives
Whether knockout rose thrives on a given site comes down to its soil pH, drainage, sun, and frost dates — the conditions that vary parcel to parcel.
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.
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Frequently Asked Questions
Can I grow Knockout Rose in my zone?
Zone data for knockout rose is being finalized. A Growable Ground report checks your parcel's full suitability against federal soil, climate, and zone data.
When should you plant Knockout Rose?
Most growers plant knockout rose after the last spring frost, once the soil has warmed. 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 (Xerces Society, Pollinator Partnership).
Is Knockout Rose safe for pets?
Knockout Rose is not known to be toxic to dogs or cats based on available data (ASPCA). Always supervise pets around new plantings.