Plant Encyclopedia

Knock-Out Rose

Rosa x ‘Radcon’

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Knock-Out Rose, bright red leaves

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For those who love the look of bright roses but don’t want all the hard work, you might consider the Knock-Out roses (Rosa x ‘Radcon’) for your landscape. These rose bushes are known for their easy care, increased disease resistance, and extended blooming season. The Knock-Out roses are deciduous shrubs that look fantastic in a group planting or as a single plant. When you are ready to plant a rose shrub in your landscape, make sure to choose the stunning Knock-Out roses.

Plant Attributes

Knock-Out rose bushes are cold-hardy, and they offer proficient blooming throughout the growing season. These rose varieties produce a colorful display of blooms. You can expect the first blooms to arrive in the spring, and they will last to the first hard frost in the autumn. The Knock-Out roses come in a wide range of colors. Its flower varieties feature either single or double petals. When you want to find a rose bush for your landscape theme, there is a Knock-Out rose variety to fit your needs.

Landscape Use

You can add these fast-growing and compact shrubs to a border or use in a cottage garden. These shrubs do well as a single plant or in a mass planting. For group plantings, the Knock-Out rose is an excellent choice for your landscape.

These adaptable Knock-Out roses are also grown in containers to add a pop of color to a porch or patio area. The rose shrubs are exceptional specimen plants for formal gardens, especially when used as a centerpiece surrounded by low-growing shrubs or plants.

Planting & Care

These roses should be planted in the spring or early fall for the best results. The shrubs are easy to grow, and they will do best in USDA hardiness zones 5 to 9. When the Knock-Out rose reaches maturity, it will attain a height of four feet tall. As long as there is enough sunlight in your landscape, you can plant the Knock-Out rose in any space. For the most part, these roses thrive in those landscape areas that receive the most sunlight during the day. The Knock-Out roses tolerate partial shade, but their blooms may be reduced.

The Knock-Out roses prefer well-draining, slightly acidic soils. These shrubs are naturally bushy and compact, but you can prune them to fit into smaller spaces around your landscape.

If you want to maintain the size and shape of the shrub, a light pruning should be done in the early spring or late winter when it is dormant. By pruning on this schedule, you can keep the plant healthy and encourage it to grow in the spring. Deadheading is unnecessary for the rose, but it will help the shrub to reflower in the following growing season.

After pruning, the rose bush should be fed with a balanced fertilizer. However, the rose bushes will benefit from regular feedings throughout the growing season. You will want to stop fertilizing after the first hard frost. Fertilizing should also not be done immediately after planting since you want it to have a complete bloom cycle.

Watering is very important to any plant, especially the Knock-Out rose. You want to water this plant regularly during the first growing system. With added water, the roses develop a sound root system. After the roots have been established, you should water once every week or two. These plants thrive when watered deeply in the morning. While these roses are drought-tolerant, you might want to add a layer of mulch to retain moisture throughout the growing season.

Compared to other shrub roses, Knock-Out roses have improved disease resistance and need no fungicide treatments.

Additional Information

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Knock-Out Rose


The (Rosa x ‘Radcon’) Knock-Out roses are easy to grow, and they don’t need any special care to produce beautiful blooms. You can plant them as individual plants among shrubs or use them as perennials in mixed beds. These plants make a colorful hedge or a stunning border near a foundation. This rose variety is an excellent choice for any landscape design.

At Arbor Valley Nursery, we would love to help you with your landscaping needs. We carry a large inventory of products, including the Knock-Out roses. These exceptional roses can be used in a variety of landscape settings. If you would like to order these hardy roses or have any questions, please take a few moments to fill out the contact form.

Plant Features

  • Watering Needs: Water regularly, when top 3 in. of soil is dry.
  • Botanical Pronunciation: ROH-zuh
  • Plant type: Rose, Shrub
  • Deciduous/evergreen: Deciduous
  • Growth habit: Compact
  • Growth rate: Fast
  • Average landscape size: Fast growing; reaches 3 to 4 ft. tall and wide.
  • Special features: Attracts Butterflies, Compact Form, Easy Care, Fall Color, Fast Growing, Improved Disease Resistance, Pet Friendly
  • Foliage color: Green
  • Blooms: Spring through Fall
  • Flower color: Red
  • Flower attributes: Fragrant, Long Bloom Season, Repeat Flowering, Showy Flowers
  • Garden style: Cottage, Mediterranean
  • Companion Plants: Peony (Paeonia); Hydrangea (Hydrangea); Coneflower (Echinacea); Lilac (Syringa); Catmint (Nepeta)

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