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Should You Deadhead Knockout Roses?

July 27, 2018 By Laura 2 Comments

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This post and photos may contain Amazon or other affiliate links. If you purchase something through any link, I may receive a small commission at no extra charge to you. Any supplies used may be given to me free of charge, however, all projects and opinions are my own.


Should you deadhead Knockout Roses? If you do, you’ll enjoy nearly constant blooming throughout the Summer and possibly into the Fall season.

Should you deadhead Knockout Roses?

Please note: I may use Knock Out Roses and Knockout Roses interchangeably in this article. Although the official name is Knock Out (two words), there are many who use the word Knockout (one word) instead. I’m one of them who slips from time to time between each version, so don’t hate me!

First off, we need to ask the main question everyone is curious about:

Should You Deadhead Knockout Roses?

Many experts — including the fine folks at the company that produces Knock Out Roses — will tell you no, there’s no need to deadhead these roses because Knock Out Roses will do this all by themselves, on their own.

And that’s true to a certain extent.

Knockout Roses will eventually discard their own dead flowers. 

Eventually.

Meanwhile, the overall shrub can look very sad with lots of dead flower stalks poking out all over, and fewer and fewer active blooms on the shrub.

But you want blooms throughout the Summer, am I right? Lovely flowers to enjoy each and every day!

rose buds on a Knockout Rose bush

I say, “Yes, you should deadhead Knock Out Roses!” And there are many out there who will agree with me, although it does mean some extra work on your part.

Benefits of Deadheading

There are two main benefits to deadheading Knock Out Rose bushes.

  1. The appearance of a deadheaded shrub instantly looks much better.
  2. If you deadhead Knock Out Roses as part of your Summer garden chores, you’ll enjoy almost constant blooming throughout the season.

Here’s one of our Knock Out Rose bushes before I did my weekly deadheading:

Knockout Rose bush in Summer before any deadheading has been done

This rose bush looks fine from a distance, in part because I regularly deadhead each week, so there’s never too much work to do, to maintain an ever-blooming shrub.

Upon closer look, follow the arrows to see which parts of the Knock Out Roses need to be trimmed away:

The yellow arrows point to what's left after each Knockout rose finishes blooming.

Sometimes you will find a deadhead candidate hidden among other blooming roses:

Three Knockout Roses blooming with a tiny leftover spent bloom hiding among them.

And you can also find individual roses that have come and gone as well:

The yellow arrow points to an example of what to cut off the shrub.

The Best Tools for Easy Deadheading

Before you begin deadheading Knock Out Roses, make sure you have a good pair of nitrile-coated gardening gloves — so you can avoid getting pricked by any thorns — and a good pair of bypass pruners.

You can read about my favorite gardening gloves here: My Garden Gloves are the Best

And my favorite pruners are these bypass pruners by Fiskars.

I toss all of my deadheading refuse into a basic bucket that I carry around the garden. It isn’t anything fancy — far from it: it’s a used kitty litter bucket which is the handiest thing around! We have several of them…and sadly this particular brand of litter no longer sells it in their awesome buckets, so we are now hoarding them! 

How to Deadhead Knock Out Roses

Find one of the spent blooms, like below:

Photo demonstrates how to deadhead Knockout Roses

Snip it off with the pruners while holding it in your other gloved hand:

Deadheading a spent rose (what's left of it) from a Knockout Rose shrub.

And when you see more than one of these together on your shrub?

You can snip off multiple spent flowers if they are next to each other.

Just grab both and snip them off. Easy peasy, no fancy cuts to make or angles to pay attention to.

how to deadhead knockout roses using bypass pruners

What remains are a couple of short stems that within a week will fall away on their own.

A yellow circle shows what's left after you remove a spent bloom.

I spend time trimming spent flowers on Knock Out Roses too:

An individual rose with only two petals left: another candidate for deadheading.

There’s only a few petals left, and by this point those petals are about to fall off anyway.

How fast will my Knock Out Roses rebloom?

The simple answer is: very fast and almost all of the time!

Look at this picture below:

Yellow arrows pointing to the new growth near where the deadheading took place on the Knockout Rose bush.

The first arrow on the left points to a new rose bud already forming, while the second arrow points to more new growth.

As the stems fall away, the newest growth will rise up beyond those old stems and will bloom in about a week.

How often should I deadhead Knock Out Roses?

I try to make the rounds and deadhead our Knock Out Roses once a week throughout the Summer months.

If you do a bit each week, you should have a never-ending display of pretty roses!

Before and after pictures sides by side of a deadheaded Knockout Rose bush

There really isn’t that much of a difference in my before and after pictures, which shows you how a regular schedule will keep your Knock Out Roses looking great all the time.

I’m not out there every Monday with the pruners, but I am out there at least once a week with the sole purpose of deadheading our Knock Outs.

Should You Deadhead Knockout Roses?

Video: How to Deadhead Knock Out Roses the Easy Way!

Happy gardening!

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Comments

  1. Cassie says

    July 5, 2020 at 2:01 pm

    I couldn’t agree more!! Deadheading makes SUCH a difference and keeps the plant in constant bloom and promotes quicker new growth. I highly recommend, you won’t be sorry!!

    Reply
    • Laura says

      July 8, 2020 at 12:39 pm

      So glad you agree Cassie! It’s a bit of effort but wow does it pay off! Thanks for weighing in!

      Reply

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Pet Scribbles is where I share my craft tutorials, home and garden projects, and occasional stories about my cats. I can never have enough pretty craft paints to work with, and I love to make things look time-worn with distressing and aging. Gardening is my therapy!

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