Sunny Knock Out rose

Sun

Full sun, ideally at least 6 hours daily; light afternoon shade can help in very hot climates.

Water

Water deeply when the upper 2 in (5 cm) of soil becomes dry. Established plants tolerate brief dry spells, but flower better with consistent moisture.

Soil

Fertile, well-drained loam or improved clay or sandy soil; slightly acidic to neutral soil is ideal. Avoid waterlogged ground.

Height

3-4 ft (0.9-1.2 m)

Spread

3-4 ft (0.9-1.2 m)

Flowers

Repeated flushes from late spring until autumn frosts; single, bright yellow flowers fade to cream, especially in warm weather.

Foliage

Glossy green, compound leaves with toothed leaflets; usually deciduous, sometimes retaining leaves in mild winters.

Growth

Moderate to fast

Care needed

Low

• Pollinators
• Heat tolerant
• Disease resistant
• Wildlife
• Low allergen
• Fragrant

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.1 ft (0.64 m)

3. After 2 years

   2.5 ft (0.78 m)

4. After 3 years

   3 ft (0.91 m)

5. After 5 years

   3 ft (1.1 m)

   full size

About 4 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Growth rate

Fast

• Water at soil level, soaking the root zone rather than sprinkling the leaves.
• Apply a rose fertiliser as spring growth starts, following the label; stop nitrogen feeding in late summer where winters are cold.
• Spread 2-3 in (5-8 cm) of organic mulch over the roots, keeping it clear of the stems.
• Leave room between shrubs for air circulation and access for pruning.
• In colder parts of its range, protect the crown with loose mulch after the ground begins to freeze.

Pruning. In late winter or early spring, as buds begin to swell, remove dead, damaged and crossing stems, then shorten healthy growth by roughly one-third to one-half. Deadheading is optional because the plant repeats without it.

Late winter

Check for winter damage and prune as buds begin to swell; delay pruning if severe cold is still likely.

Spring

Plant container-grown roses once the soil is workable, water thoroughly and apply mulch.

Mid-spring

Feed established plants as active growth develops.

Summer

Water deeply during dry weather and inspect young shoots and flowers for pests.

Late summer

Stop nitrogen feeding in cold-winter regions so new growth can mature before frost.

Late autumn

Remove diseased fallen leaves and add crown protection where winters are severe.

• Plant in groups along a sunny path for repeated yellow-to-cream colour.
• Use as a low informal hedge, allowing space for its mature width.
• Combine with purple catmint or salvia for a clear colour contrast.
• Place in mixed shrub borders with evergreen plants that provide structure after leaf fall.
• Grow in a large, well-drained container near a seating area where its light fragrance can be noticed.

Garden styles it suits: Cottage garden, Traditional, Low-maintenance, Sensory garden, Pollinator garden and Small-space.

Plant it with: Catmint, Hardy geranium, Meadow sage, Lavender, Lady's mantle and Alliums.

Wildlife: The open flowers provide accessible pollen for bees and other insects. Dense, prickly growth can offer shelter for small birds.

• Aphids can cluster on soft shoots: wash them off with water and encourage ladybirds and other predators.
• Black spot can still occur in humid conditions: water at ground level, improve airflow and remove infected fallen leaves.
• Japanese beetles, where present in North America, chew flowers and leaves: hand-pick them into soapy water; avoid placing beetle traps beside the roses.
• Rose rosette disease, especially in affected parts of North America, causes distorted red growth, excessive prickles and abnormal shoot clusters: remove the whole affected plant, including roots, because there is no cure.

Not known to be toxic to cats, dogs, horses or people. Flowers, leaves and hips are not considered poisonous, but prickles can cause puncture wounds and swallowed stem pieces can injure the mouth or digestive tract.

• Julia Child rose (Rosa 'WEKvossutono')

  Has densely double, rounded yellow flowers rather than Sunny Knock Out's open, single flowers.

• Golden Showers rose (Rosa 'Golden Showers')

  Produces long climbing canes and larger, semi-double yellow flowers; Sunny Knock Out forms a compact, self-supporting shrub.

Sunny refers to the yellow flowers, Knock Out is the rose series name, and 'Radsunny' is the cultivar denomination.

Propagation. Softwood or semi-ripe cuttings can produce plants true to the cultivar; seedlings will not reliably match it. Check current plant breeders' rights or patent restrictions in your country before propagating.

Accepted botanical name

Rosa

Sources: GBIF (CC BY 4.0). The care and design notes are LandscapeGPT's own.