Double Knock Out® Rose

Let's Grow

About Double Knock Out® Rose

If you loved Knock Out® roses, you’ll adore the newest addition to the collection:Double Knock Out® Roses.  These gorgeous rose bushes have all of the key features you’ve come expect from ‘Knock Out®’ roses, including incredible disease resistance.  However, these plants have fully double flowers, so they look just like classic, heirloom roses.  By the end of May,Double Knock Out® Rose bushes will explode into an incredible amount of rosebuds, which continue to bloom until fall, providing three full seasons of garden color!

It’s easy to get overwhelmed by the sheer variety of roses on the market today, but if you only grow one rose type, Double Knock Out® Roses can meet all of your needs.  Not only are they resistant to issues like mildew, blackspot and rust, they also can be planted just about anywhere!  From Florida to New England,Double Knock Out® can handle a variety of growing conditions and climates and they may even be able to grow in zone 4 with a bit of extra protection.

Double Knock Out® Rose
Botanical Name	Rosa 'Radtko'
Plant Hardiness	Zone 5-10
Mature Height	3 to 4'
Mature Width	3 to 4'
Sun Needs	Full Sun
Does Not Ship To	AK, AZ, CA, HI, ID, MT, NV, OR, UT, WA, PR

 

Growing between 3 and 4’ tall, Double Knock Out® Roses are the perfect size for inground plantings and they make exceptional specimen plants.  To create a bigger impact, try planting a few of these rose bushes together along garden walkways or fence rows or keep them in containers on a sunny porch.  From cottage gardens to modern landscapes, versatileDouble Knock Out® Roses will be the stars of any garden, from late spring until the first hard frost of autumn!

 Special features:

• Reblooming flowers from late spring through fall
• Disease resistant
• Heat, cold and drought tolerant
• Can grow in clay soil
• Perfect for containers

How to care for roses

Many gardeners are reluctant to keep roses because some rose types are notoriously difficult to grow. But Double Knock Out® Roses are hardy plants that are super beginner friendly.  All they need is consistent water, full sun and a regular application of fertilizer and they’ll rebloom again and again for season long color. 

Double Knock Out® Roses will benefit from a spring pruning.  Snip away dead branches and cut stems back to 6 to 12” above the ground, which will encourage more bud development.  These plants are fast growers too, so they bounce back quickly after pruning.

For more tips on how to grow roses, check out the easy care tips below.

Best time of the year to plant roses

The best time of the year to plant rose bushes is either in early spring after your last frost date or autumn, about 6 weeks before frost is expected. Roses can also be planted in summer, but they will need additional care and more frequent watering to help them adjust to your garden.

Where to plant rose bushes

Roses, including Double Knock Out® Roses, should be planted in full sun and rich well-draining soil.  These plants can also be kept in containers, but they should be located in an area that receives at least 6 hours of bright light daily. 

How to plant roses

Double Knock Out® Roses can be planted singly or in a large grouping to create an even showier display of flowers.  Just make sure plants are spaced at least 3’ apart to give your roses plenty of room to spread.

When you’re ready to start planting, dig a hole that is at least as deep as your plant’s root ball and 2 to 3 times as wide.  Place your plant in the hole so that it is planted at the same depth that it was growing in its nursery pot and then backfill the hole with soil.  After planting, keep yourDouble Knock Out® Roses well-watered by providing them with 1 to 2” of water per week.

To give your new rose bushes a head start on the growing season, consider amending your soil with compost or other organic matter prior to planting your roses.  Once your plants are in the soil, add a thick, 2 to 3” layer of mulch around your plants to reduce weeds and conserve soil moisture levels.

Growing roses in pots

Double Knock Out® Roses can also be grown in pots, provided that pots are well-draining and at least 15 to 20” in diameter.  Select containers that are as deep as possible, ideally 2 to 2 ½’ deep at a minimum, to ensure your rose bush roots can develop fully.

Growing roses in containers is a great solution for small garden spaces and it also gives you more choices for where you can locate your roses.  Container roses can be kept on balconies, sunny porches, patios and other outdoor spaces that could use a bit more flower color!

How tall do roses grow?

Mature Double Knock Out® Roses grow about 3 to 4’ tall and as many feet wide.  They can also be kept a bit smaller with pruning.

History of Double Knock Out® Rose

Roses were first cultivated in Asia about 5000 years ago and they have remained one of the mostly highly coveted garden plants ever since. Prized for their colorful and delicately formed blooms, roses are mostly kept as ornamentals; however, some produce edible rosehips that can be brewed into teas and jams and jellies. Fragrant rose varieties are top choices for scent gardens as well and roses of all sorts are commonly grown in cottage garden designs.

Knock Out® roses were first developed by the esteemed plant breeder Will Radler who wanted to create a cold hardy and disease resistant rose type. The resulting Knock Out® roses were a huge hit with gardeners and they even won the All-America Rose Selections award in 2000.  Over the years, millions of‘Knock Out®’roses have sold, but Mr. Radler dreamed of an improved rose variety. So he createdDouble Knock Out® Roses, which have even more petals on their fully double flowers.

Buying Double Knock Out® at Cold Creek Nurseries

All of our plants come from the original breeders who are committed to growing roses from cuttings, rather than seed.  This ensures that the unique characteristics of the parent plants are preserved, so you get exactly the rose bush you want.  When you orderDouble Knock Out® Roses from us, you’ll receive healthy plants shipped right to your door in sturdy pots.  Simply slip the pot away from the plant and get growing!