Knock Out® Orange Glow™ Shrub Rose

Rosa ‘Radslam’ PP35,826

Knock Out Roses®

Fiery Orange Blossoms that Glow in Garden Light, Plus Knock Out® Reliability
Cold Hardy: Thrives in Zones 4-11
Grows 3-5 ft Tall, 3 ft Wide
Great Choice for Privacy Screen or Hedge
Pollinator-Friendly Shrub

$64⁹⁴

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Plant Size

#2 Container #3 Container

Product variants

Planting & Care

Where to Plant

Sunlight: Your Knock Out needs at least six hours of direct sunlight daily for best performance. While four hours of sun allows survival, the tradeoff will be fewer blooms and a noticeably paler orange color compared to full sun placement.
Soil: Roses thrive in rich, well-draining soil with plenty of organic matter. For heavy clay, mix in generous amounts of compost or aged manure to improve porosity; for sandy soil, the same amendments will help retain the necessary moisture and nutrients.

Watering Requirements

For the first growing season, water deeply two to three times per week to help your shrub establish a strong, deep root system. Once mature, this rose is quite drought tolerant, but you should aim for one inch of water per week for continuous, abundant blooms. Inconsistent watering during dry heat will result in smaller flower heads and can make the plant vulnerable to stress.

Pruning Tips

This type of shrub rose blooms reliably on new wood, meaning the flower buds form on the current season's growth. The best time to prune is in early spring just as the buds begin to swell. Simply cut all canes back by about one-third to one-half their height; this shape correction encourages a dense, attractive shrub form and improves air circulation, which is key to maintaining its famous disease resistance.

Fertilizer Needs

Apply a quality, slow-release granular fertilizer formulated for roses, such as a balanced 10-10-10, just after the spring pruning. A second application in mid-summer will help fuel the heavy reblooming cycle. Avoid any high-nitrogen feedings after August 1st, as this encourages soft, new growth that will not have enough time to harden off before winter frost, inviting cold-weather damage.

Delivery and Shipping

Shipping Rates

Ships in 7-10 business days • Tracking provided • Weather protected

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

✓ Zone-specific timing • ✓ Professional packaging • ✓ Health guarantee

Understanding Our Container Sizes

At Nature Hills, our plants are sold in industry-standard nursery containers. You will notice we use the word "container" rather than "gallon." Container numbers follow a nursery trade size standard, not liquid volume. The number tells you the plant's size category and general maturity level. A larger container means a more established plant with a stronger root system.

Container Sizes

Quart

Plant age: 6 months to 1 year
Best for: Ground covers, perennials, ornamental grasses
What to expect: Our smallest and most affordable size. Well-suited for planting in multiples across a large area. Allow 1 to 2 seasons for full establishment.

#1 Container

Plant age: 1 to 2 years
Best for: Shrubs, perennials, smaller trees
What to expect: About the size of a large coffee can. A well-developed root system in a manageable size. Good value choice when you have time to let the plant grow into the space over a season or two.

#2 Container

Plant age: 2 to 3 years
Best for: Shrubs and trees where you want faster establishment
What to expect: A noticeable step up from a #1 in both plant size and root development. Good choice when you want visible presence without going to a larger size.

#3 Container

Plant age: 3 to 4 years
Best for: Most plants, most situations — flowering trees, shade trees, evergreen shrubs
What to expect: Our most popular size. Strong, developed root system. Plants in a #3 container make an immediate visual impact from day one. If you want a head start rather than waiting seasons for a plant to fill in, this is typically the right choice.

#5 Container and Larger

Plant age: 4 to 5+ years
Best for: Specimen plants, privacy screens, maximum instant impact
What to expect: Large, mature plants ready to make an immediate statement in your landscape. We also carry #7 and larger sizes for select varieties.

Why "Container" and Not "Gallon"?

Nursery container sizes follow an industry trade standard established for the nursery and horticulture industry. The number is a size designation, not a measurement of liquid volume. Actual soil volume varies by plant type, root mass, and growing medium. Using "container" is the accurate industry term. When you see #1, #2, or #3, think of it as the plant's size tier, not a gallon measurement.

Root Pouch Containers

Some Nature Hills plants arrive in a Root Pouch, a breathable fabric container made from 100% recycled materials. Root Pouches encourage denser root development through air pruning, which discourages root circling and promotes a stronger, more fibrous root ball at the time of planting.

Plants growing in Root Pouch fabric containers, showing the breathable woven fabric construction

There are two types. Knowing which one you have changes how you plant:

Degradable (brown or tan fabric): Plant the entire pouch directly in the ground. The fabric breaks down naturally in the soil over time.
Non-degradable (black or gray fabric): Remove the pouch before planting. Cut the bottom open with scissors, then peel the sides away. The fibrous root ball will hold its shape.

Not sure which type you have? Check the tag on your plant or contact us and we will confirm.

Full Root Pouch planting guide

Choosing the Right Size

Size	Plant Age	Best For
Quart	6 mo to 1 yr	Ground covers, perennials, grasses. Budget-friendly for mass plantings.
#1 Container	1 to 2 yrs	Shrubs, perennials, small trees. Value choice for patient gardeners.
#2 Container	2 to 3 yrs	Shrubs and trees where you want faster establishment.
#3 Container	3 to 4 yrs	Most plants. Immediate visual impact. Our most popular size.
#5 and larger	4+ yrs	Specimen plants, privacy screens, maximum instant impact.

Still not sure which size is right for your project? Our plant specialists are happy to help. Contact us and we will point you in the right direction.

Plant specifications
Plant Characteristics	Cold hardy, Low Maintenance, Flowering, Reblooming, Disease resistant, Heat Tolerant, Drought resistant, Attracts pollinators, Container Friendly
Hardiness Zone	5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b
Sunlight	Full sun
Height	3-5 ft
Width	3 ft
Watering Needs	Moderate
Preferred Soil	Clay, Loamy
Growth Rate	Moderate
Growth Habit	Climbing, Spreading, Trailing, Upright
Blooms In	Spring, Summer, Fall
Flower Color	Orange
Foliage Color	Green
Pet Safety	Toxic to pets
Suitable Space	Outdoors
Plant Name	Rose
Botanical Name	Rosa ‘Radslam’ PP35,826
Species	spp.
Cultivar	Radslam
Class	Magnoliopsida, Rosales
Does Not Ship To	AK, HI, ID, MT, PR

Knock Out® Orange Glow™ Rose

Get your glow on! The Knock Out® Orange Glow™ Rose PP#35,826 (Rosa 'Radslam') is a show-stopping, everblooming Shrub Rose with fiery orange blossoms that seem to glow in the garden! This new addition to the Knock Out® family is just as low-maintenance, disease-resistant, and floriferous as its predecessors, but with an exciting new color twist.

The warm orange petals transition into sunset hues, making this shrub a standout in any landscape. Plus, it reblooms continuously from late spring to frost, ensuring non-stop color and delightfully soft fragrance throughout the season.

Its deep green foliage stays clean and lush, thanks to its superior resistance to black spot, powdery mildew, and rust. In the fall, the foliage takes on golden hues, adding another layer of seasonal interest before winter dormancy!

Like all Knock Out® Roses, Orange Glow™ thrives in Zones 4-11, tolerating cold, heat, humidity, and urban pollution with ease. It flourishes in full sun and well-drained soil, adapting to various conditions while requiring minimal care. Whether you're a beginner gardener or a seasoned rosarian, this brilliant bloomer delivers vibrant color without the fuss!

Key Features

Glowing orange blooms with sunset undertones
Reblooming from late spring to frost
Compact, rounded form (3-5 feet tall and wide)
Disease-resistant and low-maintenance
Heat and humidity-tolerant
Lush green foliage with a golden fall color
Self-cleaning
Widely adaptable!

Landscaping Uses

Compact and bushy, this rounded Rose shrub reaches 3-5 feet tall and wide, making it perfect for sun gardens of all sizes. The Knock Out® Orange Glow™ Rose is a compact, floriferous shrub ideal for brightening up any garden space. Its manageable size and prolific blooms make it a versatile choice for various landscape designs.

Stunning focal point in foundation plantings
Eye-catching border or mass planting
Mixed into perennial gardens for season-long color
Thrives in large containers for patios and balconies
Used as a colorful low hedge along pathways or fences
Nectar and pollen-rich resource for Bees, Butterflies, and other beneficial insects
Defensive plantings and hedges - In addition to its beauty, the naturally thorny stems make it an excellent choice for defensive barriers, helping to deter trespassers—both the two-legged and four-legged kind—while still providing a glowing display.

Care and Maintenance

As a deciduous, shrub-form Rose, Knock Out® Orange Glow™ is easy to grow and requires minimal maintenance while delivering maximum impact.

Planting Time: Spring or fall for the best establishment
Sun Needs: Full sun (at least 6 hours of direct sunlight), preferring the drying power of the morning sun for the healthiest foliage
Soil Needs: Well-drained, loamy soil; tolerates various soil types as long as they are not soggy or compacted
Moisture Needs: Moderate regular moisture but not soggy; water deeply in dry spells
Mulch: Apply a 3-4 inch layer of mulch, shredded bark, or compost to retain moisture and regulate soil temperature
Fertilization Needs: Feed with a balanced Rose fertilizer in early spring and midsummer for best blooms
Pruning Info: Prune Roses in early spring to shape and encourage fresh growth; blooms on new wood
Renewal Pruning: Cut back by one-third every few years to rejuvenate the plant
Special Needs/Perks:

Deer seldom bother these thorny shrubs unless desperate
Disease-resistant
Self-cleaning (no deadheading required)
Drought-tolerant once established

A Glowing Addition To Your Garden

The Knock Out® Orange Glow™ Rose lives up to its name, delivering an eye-catching glow that lasts all season long. Whether planted en masse, as a border, or in a container, this resilient and radiant Rose will brighten your landscape with ease.

Order yours now from Nature Hills Nursery and enjoy a garden filled with glowing orange blooms all season long!

Knock Out Orange Glow Shrub Rose makes a thoughtful Mother's Day gift. Browse our Mother's Day flower collection for more spring blooming gift ideas.

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Frequently Asked Questions

How tall and wide does the Knock Out® Orange Glow™ Shrub Rose grow at maturity?

The Knock Out® Orange Glow™ Rose reaches 3-5 feet tall and wide at maturity, forming a compact, rounded shrub. This manageable size makes it perfect for foundation plantings, borders, or even large containers in zones 4-11.

Is the Knock Out® Orange Glow™ Shrub Rose disease-resistant, especially to black spot, powdery mildew, and rust?

Yes, the Knock Out® Orange Glow™ Rose offers superior resistance to black spot, powdery mildew, and rust, keeping its deep green foliage clean and lush throughout the growing season. This disease resistance makes it an excellent low-maintenance choice for zones 4-11. Shop at Nature Hills for this resilient bloomer.

Does the Knock Out® Orange Glow™ Shrub Rose require deadheading, or is it self-cleaning?

The Knock Out® Orange Glow™ Rose is self-cleaning and does not require deadheading. Like other Knock Out® varieties, spent blooms drop naturally while the plant continues producing new flowers from late spring to frost. You can simply enjoy continuous blooms without the maintenance of removing faded flowers.

How much sun does the Knock Out® Orange Glow™ Shrub Rose need for best blooming?

The Knock Out® Orange Glow™ Rose needs full sun for optimal blooming and continuous flower production from late spring to frost. Like all roses, it performs best with at least 6-8 hours of direct sunlight daily. Plant it in your sunniest spot for the most vibrant orange blooms.

What are the soil and watering requirements for planting Knock Out® Orange Glow™ Shrub Rose?

Knock Out® Orange Glow™ thrives in well-drained soil and full sun conditions. Once established, it's quite drought tolerant and requires only moderate watering during dry spells. Water deeply but infrequently to encourage strong root development. Shop at Nature Hills for quality plants.

Can Knock Out® Orange Glow™ Shrub Rose be grown in containers?

Yes, Knock Out® Orange Glow™ Rose thrives in large containers. This compact shrub reaches 3-5 feet tall and wide, making it perfectly sized for container growing in Zones 4-11. Use a large pot with good drainage and place in full sun for continuous blooms from late spring to frost.

Does the Knock Out® Orange Glow™ Shrub Rose come own-root or grafted, and what does that mean for hardiness?

Knock Out® Orange Glow™ roses are typically sold as grafted plants, though some growers offer own-root versions. Grafted roses have better cold hardiness in zones 4-6, while own-root plants are more heat tolerant in zones 9-11. Check with your supplier about rootstock type when ordering for your specific zone.

What fertilizer is best for Knock Out® Orange Glow™ Shrub Rose, and when to apply it?

Apply a balanced 10-10-10 or rose-specific fertilizer in early spring when new growth emerges. Feed monthly through summer to support continuous blooming from late spring to frost. Stop fertilizing 6-8 weeks before your first expected frost to allow the plant to prepare for winter dormancy.

Knock Out® Orange Glow™ Shrub Rose

Rosa ‘Radslam’ PP35,826