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  • Double Knock Out® Rose
  • Double Knock Out® Rose
  • Double Knock Out® Rose
  • Growing Zones: 5-10
    What's my zone?
    Mature Height: 3-4 ft.
    Mature Width: 2-3 ft.
    Sunlight: Full - Partial
    Blooms: Spring-Fall
    Spacing: 3 ft.
    Botanical: Rosa x 'Radtko' PP#16202
    Cannot Ship to: AZ
    This plant thrives in the green shaded regions above.

    Double Knock Out® Rose

    4.75806451613 out of 5

    Double Knock Out® Rose
    • 2 Gallon
    • 1 Gallon
    $39.98 to $49.98 $$29.99 (save 50%)
    Ships Tomorrow!
    Organic Planting Mix
    Root Rocket Fertilizer
    • Description
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    Non-Stop, Explosion of Blooms for 9 Months!

    Rarely does a plant take the gardening world by storm as strongly the American Rose Society's 2000 "All America Rose Selection" winner -- the Knock Out Rose. Unlike other roses, Knock Outs required no deadheading, improved disease resistance and nonstop flowering from spring through fall. Doubling the impact of the original Knock Out's single blossoms is the Double Knock Out Rose, which offers a dazzling and colorful display that is unrivaled among other roses.

    Profusion of flowers – full shrubs are covered with double flowers all season long.
    Low maintenance – unlike most roses, no spraying or dead-heading needed!
    Disease-resistant – holds up better to black spot and powdery mildew than other roses.

    If you've tried growing other types of roses, such as hybrid teas, but you quickly realized how much work was needed to keep them healthy and blooming, Double Knock Out Roses may be just what the plant doctor ordered. Other roses decline if you don't have time to prune them properly, or when black spot and powdery mildew spread quicker than an intensive spraying regimen can manage. But if you plant Double Knock Out Roses, you'll spend more time enjoying them than taking care of them.


    The Double Knock Out is classified as a shrub rose, which means that plants grow fuller, in a more rounded shape, than other classes of roses, such as hybrid teas or climbers and ramblers. The shape is proportionate, with an equal height and width. Flowers are cherry-red or pink, depending on cultivar. Unlike re-blooming or repeat blooming plants, which have separate bloom times at different times of year, the Double Knock Out Rose is a continuous bloomer, which means you'll see a non-stop floral display instead of sporadic blossoms on the plants.

    Landscape Design Options

    Specimen Plant
    One Double Knock Out Rose shrub, strategically placed as a focal point in your sunny garden, will draw the eye as it makes a colorful impact statement. By planting smaller flowering plants (or foliage plants) around or in front of your Double Knock Out Roses, you can create a tiered landscape design that enlivens a bare spot in your yard.

    Flowering Fence
    If you don't need chain-link or wooden fencing to keep your dog inside (or the neighbor's dog outside), you can plant Double Knock Out Roses along both sides of your yard to create a stunning "flowering fence." This living fence will add definition to your property lines while framing your yard to enhance your landscape design.

    Cottage Garden
    Roses are the quintessential cottage-garden plant, and Double Knock Outs really deliver. Instead of having a formal garden that has structure and definition; design a cottage garden with a looser, more casual look to soften the lines of your yard.

    Cutting Garden
    Although Double Knock Out Roses aren't fragrant like other types of roses, their double blossoms add a touch of beauty to any room in your home. On the plus side, for people with allergies who love roses, but who can't enjoy fragrant flowers into their homes, Double Knock Outs are the perfect substitute for the strong fragrances that other flowers exude.

    Container Plant
    If you want to enjoy Double Knock Out Roses on your sunny deck or patio, you can easily grow these shrubs in a container. Choose a heavier-weight wooden, terracotta or ceramic pot instead of plastic to keep the mature shrubs upright in windy weather. At the corners of your deck or patio, arrange three containers – one at the tip of the corner and the other two pots staggered in front – in a triangular formation. This will add depth to the design and you'll enjoy many more colorful flowers than if you use a single pot. If you have an elevated deck, particularly at the second-story level of your home, make sure the decking construction can support the weight of all filled containers. (Don't forget to factor in the additional weight that water will add to the potting mix after a heavy rainfall, and choose containers with drainage holes.)


    Drought-Typically, roses are not drought-tolerant plants. The Double Knock Out Rose is an exception to this rule. Although drought-tolerant does not mean drought-loving, Double Knock Outs can withstand short periods of drought without suffering adversely. However, like most landscape plants, during periods of severe drought, these shrubs need to be watered.

    Heat-Although Double Knock Out Roses are cold-hardy to Zone 5, they show remarkable tolerance to the heat in warmer zones. During the heat of summer, other types of roses may experience a lag in blooming, but Double Knock Outs are unfazed.

    Humidity-If you live in the humid South, you know how challenging it is to grow healthy roses in that climate. Many Southern gardeners have claimed Double Knock Out Roses as their favorite garden plant because of how these shrubs prosper in the humidity.


    Pests-If you consider the common insect pests of roses, aphids probably come to mind first. Although Double Knock Out Roses are not immune from these pests, they are more resistant than other types of roses.

    Diseases- Black spot and powdery mildew, which are fungal diseases of plants, plague most roses. Double Knock Out Roses have a proven resistance to the pathogens that cause these problems.

    When to Plant

    It's best to plant most roses during their winter dormant season, but Double Knock Out Roses are so resilient that (with proper planting technique and aftercare) you can plant them any time during the year.

    How to Plant

    Care in planting Double Knock Outs will make the difference in a shrub that simply survives or thrives. Your roses will arrive healthy, with a well-developed root system. Follow these planting guidelines to get your shrubs off to a good start in your garden:

    Selecting the Site
    Double Knock Out Roses are perennials in USDA plant hardiness zones 5 through 9. (If you're planting your shrubs in containers, this places their roots above ground level where they will not be insulated by the surrounding soil, so they'll overwinter in their pots to Zone 6.) A full-sun location (at least 6, but preferably 8 hours of sun each day) promotes fuller foliage growth and more flowers. Double Knock Out Roses aren't too fussy about the type of soil they grow in, but they do need a well-draining site. If the roots sit in soggy soil, they may rot. Before excavating planting holes, have a locate service mark the ground above any underground utility lines so you don't sever them when you dig.

    Preparing the Site
    Take a soil sample to your local Cooperative Extension Service for testing. Extension staff can help you interpret the results and recommend how to adjust the soil pH to 6.0-6.5, which is optimal for Double Knock Out Roses. Loosen the soil on site by digging or tilling to a depth of 6 inches. Spread an organic amendment, such as compost, in a 2-inch layer over the entire planting area and work it into the loosened soil.

    Planting Hole Depth and Width
    Dig a planting hole wider than it is deep, using the root ball of your Double Knock Out Roses as a guide. The hole should be only as deep as the root ball but several times as wide. Gently remove your plant from its container and place it in the planting hole, checking its depth to make sure it won't be planted deeper in the ground than it was in its container. Backfill the hole with the soil you removed when digging without adding potting mix, fertilizer or any soil amendments to the planting hole. Very lightly firm the soil around the shrub.

    Add 2 to 3 inches of mulch, such as chopped leaves, pine needles, shredded pine bark, hardwood chips or nuggets around your plants to the width of the hole you dug. This will help conserve moisture and keep the weeds at a minimum. Pull the mulch away from the base of your shrub.

    Give your newly planted Double Knock Out Rose bush a deep, thorough soaking. Always water at the base of the plant to keep its leaves dry. Water on the foliage may cause spotting and encourage disease.

    Roses are healthier when there's good air circulation around each plant. Space plants 4 feet away from other plants, walls and fences.

    Container Plants
    Fill pots with a commercial soilless potting mix instead of garden soil. Container roses will dry out more quickly than in-ground plants. Water potted plants until the water flows freely from the drainage hole, and then water again (if there's no rain), when the soil begins to dry.

    Ongoing Care

    Infrequent, deep watering is better than frequent, shallow sprinklings. In the absence of sufficient rainfall (1 inch per week), hand-watering at the base of each plant or drip irrigation, such as soaker hoses, is optimal for Double Knock Out Roses.

    Based on the results of a soil test, your local Cooperative Extension Service can advise about type, formulation and frequency of fertilization to correct any nutrient deficiencies or excesses. As a rule of thumb, Double Knock Out Roses respond well to a light fertilization schedule using 12-6-6 or 10-20-20 every 4 to 6 weeks.

    Deadheading, which is a type of pruning that removes spent blossoms so the new growth can produce more flowers, is a time-intensive task that's necessary to maintain many types of roses. But Double Knock Out Roses continue to produce new flowers without needing to be deadheaded. You can leave your shrubs unpruned throughout their growing season, and they'll continue blooming. However, a few snips here and there during the dormant season will help keep them looking neat and maximize their flowering potential.

    Why Prune?
    • Double Knock Out Roses naturally grow 3 to 4 feet tall, but if they're never pruned they may grow slightly taller and begin to lose their tidy look.

    • As some branches grow, they may begin to grow inward or cross other canes, instead of growing outward, which is healthier and aesthetically more desirable.

    • Shrubs may grow thickly, reducing air circulation around the canes and increasing susceptibility to disease.

    When to Prune
    We'll ship your plants perfectly pruned and shaped, so you won't have to do any trimming until the second or third year after planting. As the buds begin to break their dormancy, usually in February or March, they'll start to swell before the new growth appears. When you notice this, it's the perfect time to do any pruning.

    Where to Prune
    Find a bud that faces outward – a small red sprout – and make a 45-degree cut one-half inch above the bud, with your cut slanting outward in the same direction and angle as the bud.

    How to Prune
    • Remove any branches that cross other branches.
    • Remove any branches that grow inward, toward the center of your Double Knock Out Rose bush.
    • Remove one-third of the older canes each year.
    • If you want to reduce the height of your shrubs, prune all the canes to 24 inches.

    Because of Double Knock Out Rose's pest- and disease-resistance, you may never have to spray your plants. But if you see aphids or other insect pests in large numbers on your plants, spray insecticidal soap as an organic pesticide, following label directions. If a fungal problem presents itself, such as black spot or downy mildew, use a fungicide labeled for use on roses.

    Exception: A disease that attacks some roses – called rose rosette disease – is caused by a virus transmitted by a tiny mite. Symptoms of this disease include thickly growing red growth (not naturally occurring red buds) and excessive thorniness. Unfortunately, there is no treatment or cure for plant viruses.

    Winter Care
    When your Double Knock Out Roses drop their leaves in autumn, rake and remove all the fallen leaves, flowers and twigs underneath plants, because diseases can overwinter on plant debris. Replace the old mulch with fresh mulch.

    How to Cut Roses
    • When you go into the garden to cut Double Knock Out Roses, take a bucket of warm water with you.
    • Select flowers that have just started to open; tight buds may not open completely and fully opened blooms won't last as long.
    • Cut the stems with a sharp knife at a 45-degree angle, and immediately plunge them into the water.

    How to Extend the Vase Life of Cut Roses
    • Strip the bottoms of stems to remove leaves that are in the water to keep the water cleaner.

    • Change the water daily to keep it fresh.

    • Dissolve a package of floral preservative into the water in your vase or make a homemade version: Stir 1 pint of a lemon-line soda (non-diet) into 1 pint of water. Add ½ teaspoon of household bleach and mix thoroughly. Use this solution instead of water when you fill your vase.

    • Store your cut roses away from bowls of fruit, because the ethylene gas that ripening fruit produces will cause the flowers to age more quickly. Although a bowl of red apples beside a vase filled with red roses may dress up your kitchen table, the apples will cause the roses to droop and drop their petals prematurely.

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