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Sunny Knock Out (Rosa 'Sunny Knock Out'), whole plant
  • Sunny Knock Out — close-up of leaves and flowers
  • Sunny Knock Out — seasonal appearance
  • Sunny Knock Out in a garden setting

Sunny Knock Out

Rosa 'Sunny Knock Out'

Easy · Beginner friendly

About Sunny Knock Out

Sunny Knock Out is a bright yellow version of the original Knock Out, producing clusters of 3-inch semi-double lemon-yellow blooms that fade to cream, with a light sweet fragrance. Growing 3 to 5 feet tall on a rounded bush, introduced in 2008, it is the first fragrant Knock Out and the only yellow in the series.

  • Fragrant
  • Disease-resistant
  • Low-maintenance
WATER
Regular
Top inch dry
LIGHT
Full sun
6+ hrs direct
HARDY
Hardy to -30°F (-34°C)
USDA hardiness zones 4–10

How to care for Sunny Knock Out

Watering

  • Springevery 7 days
  • Summerevery 5 days
  • Fallevery 10 days
  • Winterevery 21 days

Soil · Rich & loamy

  • Top dressingBark mulch15%
  • Main mixRich loam + compost 3:170%
  • DrainageGravel15%

Use fully finished compost — fresh compost burns roots.

FERTILIZER

Balanced Feed 14-14-14

An even feed covers all three needs at once, keeping leaves, roots and blooms moving together with nothing pushed out of balance.

N33%P33%K33%
  • Nitrogen · Leaves
  • Phosphorus · Roots + Blooms
  • Potassium · Strength
  • Springevery 45 days
  • Summerevery 45 days
Get watering reminders for Sunny Knock Out — free on iPhoneDownload on the App Store

At a Glance

  • NativeNorth America
  • Height3–4 ft (0.9–1.2 m)
  • Spread3–4 ft (0.9–1.2 m)
  • Flower colorYellow, Cream, White
  • Foliage colorGreen
  • SoilRich, Loamy, Well-drained
  • LocationsYard

Bloom time

BLOOM CYCLE

Peak bloom

May–Sep

J
F
M
A
M
J
J
A
S
O
N
D

Self-cleaning, no deadheading required; prune hard in late winter

Fragrance

MODERATE FRAGRANCE

Sweet scent, strongest in the Knock Out series.

Toxicity

Humans Slight

Unknown toxic principle

Slight

  • Stem
  • Contact

EXPOSURE Touching stems.

EFFECT Pricks from thorns.

NOTE Not toxic; thorns cause mechanical injury.

Safe

EXPOSURE No exposure route is reported.

EFFECT No toxic effect is reported.

NOTE Listed as non-toxic for dogs; avoid eating ornamental plants unless confirmed edible.

Safe

EXPOSURE No exposure route is reported.

EFFECT No toxic effect is reported.

NOTE Listed as non-toxic for cats; avoid eating ornamental plants unless confirmed edible.

Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

DISTRIBUTION

Sunny Knock Out · Native
  • Native
  • North America

History

Illustrated historical scene for Sunny Knock Out

Rosa 'Sunny Knock Out' is a bright yellow shrub rose released in 2008 by William J. Radler and Conard-Pyle as the fifth major introduction in the Knock Out series. Unlike its siblings, 'Sunny Knock Out' carries a genuine moderate sweet fragrance, making it the most fragrant Knock Out cultivar. Single to semi-double blooms open clear lemon-yellow with a tuft of golden stamens, fading gradually to cream and finally near white over several days, so plants carry flowers in all stages of color simultaneously.

Compact rounded plants preserve the series' extreme disease resistance, cold hardiness to zone 4, and continuous self-cleaning bloom from late spring to heavy frost. Widely adopted in public-space landscaping because yellow roses of comparable toughness were previously unavailable.

Bred by William Radler and introduced by Conard-Pyle in 2008. The first fragrant rose in the Knock Out series and the only yellow, expanding the color palette with a sweet scent that other Knock Outs lack.

Symbolism & meaning

What It Symbolizes

'Sunny Knock Out' brings sunny cheer to the famously easy Knock Out family, its bright lemon-yellow blooms aging to creamy ivory through the season. As a fragrant family member — the first scented rose in the line — it adds a soft sweet perfume to the toughness for which the series is known. Its meaning is unfussy gladness: a low-maintenance shrub that smiles and smells like summer.

  • Sunny cheer — bright lemon-yellow flowers
  • Fragrant family member — first scented Knock Out

Where the Name Comes From

Named 'Sunny' for the bright lemon-yellow flower color reminiscent of sunshine.

Uses & Fun Facts

  • Yellow blooms release light sweet rose fragrance
  • Continuous bloom on disease-resistant low-care landscape shrub
  • Dense flowering shrub forms informal sunny hedges

Related plants

More Rosa plants

Plants with similar care

Frequently asked questions

How often should I water Sunny Knock Out?

In summer, water about every 5 days; in winter, about every 21 days. Adjust for heat, pot size and drainage.

How much light does Sunny Knock Out need?

Full sun: 6+ hrs direct. Watch the leaves — scorching or stretching means the light needs adjusting.

Is Sunny Knock Out toxic to cats or dogs?

Pets Safe (Dogs Safe · Cats Safe) Educational information, not medical or veterinary advice. If exposure is suspected, contact a doctor or veterinarian.

Is Sunny Knock Out easy to grow?

Yes — it is considered an easy, beginner-friendly plant.

When does Sunny Knock Out bloom?

It typically blooms May–Sep in the Northern Hemisphere.

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