How Long Do Knock Out Roses Live? Lifespan and Bloom Period

Knock out® roses (Rosa ‘Radrazz’) are a type of garden rose known for its long blooming period. You might wonder how long they live for, the lifespan of knock out® roses. So how long do knock out roses live?

Here’s a quick response to how long do knock out roses live, then we’ll get into some details.

Generally speaking, you can expect your knock out® roses to last for 3 – 5 years – or blooming seasons. However, with some care in watering, fertilizing, and pruning, you can expect knockout roses to last several years. With proper care, they can potentially live for decades.

That’s the quick answer to “how long do knock out roses live”. But let’s get into some information that might help explain this further.

Why knockout roses are different from other roses

There are a variety of different rose types. Knock out® roses are popular because they have been cleverly cultivated primarily with regard to their blooming period. But also they are robust and easy to care for.

Knockout rose blooming period

One question might be how long do knockout roses bloom? Knock-out roses have a lengthy blooming period compared to most other roses.

They typically bloom from early spring to late fall. Some will continue blooming into the colder winter weather when most other roses are preparing for winter. Some will have occasional blooms during winter.

Knockout roses are easy to care for

The knock out rose variety is also relatively low-maintenance. They don’t require as much care and attention as other roses.

In terms of water, they don’t require as much watering and attention to watering as other roses. They are also less susceptible to pests and diseases.

Normally, diseases like black spot might be something to worry about with standard roses but knock out® roses are less prone.

How long do knock out roses live?

So, how long do knock-out roses live? Given their robust nature and ability to bloom for extended periods, you can expect a knockout rose to have a lifespan of around 3 to 5 years. However, with the right care, they can live for much longer – up to 10 years or possibly longer.

And how long do double knockout roses live? You can expect them to last 3 – 5 years with little care. But potentially they can last decades with proper care and attention.

So how do you extend the life of your knock out roses? Read on to find out how.

how long do knock out roses live

How to prolong the life of knock out roses

Knockout roses are relatively easy to care for and can live for several years with proper care.

There are a few things you can do to prolong the life of your knock out® roses:

  • Water them regularly, ensuring they get sufficient water during dry periods
  • Fertilize them regularly, roughly every 2 4 weeks
  • Deadhead them regularly throughout the blooming period
  • Protect them from extreme weather conditions
  • Prune them properly, cut back dead canes at least every 2-3 years

Following these simple tips will help ensure that your knock out® roses have a long and healthy life. Here’s some more information on caring for your knock out roses to extend their lives.

Try these knock out roses

One of the best ways to learn to care for and extend the life of your roses is to try them. Why not start with knock out roses as they’re the ones I’d recommend to all beginners? Try the ones below.

Does pruning shorten the life of knock out roses

No, pruning does not shorten the life of knock out® roses. In fact, pruning can actually help extend the life of your roses by keeping them healthy and vigorous.

Pruning also helps improve the overall appearance of your knock out® roses, so it’s a good idea to do it on a regular basis. Let’s hone down a little on when and how much to prune knock out roses that will help to extend their life.

How often should you prune knock out roses?

You should prune your knock out roses every few weeks during the growing season. This will help encourage new growth and keep your roses looking their best.

Pruning knockout roses in summer

If you live in a warm climate, you can prune your knock out® roses in late summer or early fall. This will help them recover from the heat of summer and prepare for the cooler weather of winter.

You should not look to cut them right back at this time, however, as this can damage the plant. Instead, focus on removing any dead or damaged growth, and thinning out any overcrowded areas. Your knock out rose will thank you for it and will live longer.

Pruning knockout roses in winter

If you live in a cold climate, you can prune your knock out roses in late winter or early spring. This will help them recover from the cold weather of winter and prepare for the warmer weather of summer.

At this time you can cut them back more severely, as they will be able to recover more quickly from the pruning. Just be sure not to damage the plant, as this can set back its growth, and shorten the overall life of your knock out rose.

cutting back rose canes

How often should you water knock out roses?

It is important to water your knock out® roses regularly, especially during the hot summer months. They will need about an inch of water a week, either from rain or from irrigation.

If you live in an area with high heat and low humidity, you may need to water them more often. Be sure to check the soil before watering. Knock out roses are designed to be hardy and robust roses. So you can worry about this aspect less than you might with other rose categories.

How often should you fertilize knockout roses?

As a general rule, you can fertilize your knock out® roses every four to six weeks during the growing season. Use a fertilizer that is high in nitrogen, potassium, and phosphorus. These are the three nutrients that roses need the most.

You can find out more about fertilizing roses in general in my article best NPK Ratio for roses.

You can either use a granular fertilizer or a liquid one. If you choose to go with granular fertilizer, be sure to water it well after applying it. This will help to prevent the fertilizer from burning the roots of your roses.

How long do knock out roses live ~ More roses help 🌹

I hope this has helped you understand a bit more about how long knock out roses live. As you can see, with the proper care, they can last quite a while.

As always, one of the best ways to prolong the life of any rose bush is to plant more than one. That way, if one bush eventually dies, you will still have others that will continue to bloom.

michael - rosehow

Hi, I’m Michael. My passion for roses was sparked a few years ago after visiting a dedicated community rose garden. So represents my take, my learnings, and my help for anyone looking to grow, be proud of, and harvest roses.