How Big Are Knockout Roses?

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What is the Average Height and Width of Knockout Roses?

how big are knockout roses
Image ‘File:Flower of the Dog Rose – geograph.org.uk – 1918494.jpg’ by Jonathan Kington Edit this at Structured Data on Commons, licensed under CC BY-SA 2.0

Knockout roses are known for their compact and bushy growth habit. Most Knockout rose varieties typically grow to an average height of 3-4 feet and have a similar spread of 3-4 feet[3][4][5].

How Fast Do Knockout Roses Grow?

how big are knockout roses
Image ‘File:Flower of the Dog Rose – geograph.org.uk – 1918494.jpg’ by Jonathan Kington Edit this at Structured Data on Commons, licensed under CC BY-SA 2.0

Knockout roses are considered fast-growing, with the ability to triple in size in a single season. This means that if pruned back to about 1 foot, they will grow to around 3 feet by the end of the season[5].

Are There Variations in Knockout Rose Size?

Yes, some varieties can grow slightly taller or shorter depending on the specific cultivar. For example:

  • The Sunny Knockout Rose can reach up to 5 feet in height, although this is less common[3].
  • The Petite Knockout Rose is more compact, growing to about 18 inches tall[1].
  • The Double Knockout Rose and other standard varieties generally stay within the 3-4 feet range[2][5].

What is the Recommended Spacing for Knockout Roses?

For optimal growth, it is recommended to plant Knockout roses with the following spacing:

  • When planting in clusters or for individual plants, space them about 4-6 feet apart[5].
  • For hedge planting, space them about 3 feet apart[5].
  • Ensure each plant has enough room to grow, typically providing at least 3-4 feet of space around each plant[3][4].

How Do the Sizes Differ Between Knockout Rose Cultivars?

Here are some specific size differences for various Knockout rose cultivars:

  • Petite Knockout: 18 inches tall[1]
  • Double Knockout: 3-4 feet tall and wide[5]
  • Coral Knockout: 4½ feet tall and wide[2]
  • Rainbow Knockout: 3-4 feet tall and 3-5 feet wide[2]

Reference:
1. Petite Knock Out® — The Knock Out® Family of Roses: https://www.knockoutroses.com/petite
2. The Knock Out® Family of Roses: https://www.knockoutroses.com/family
3. Answering 7 Questions Everyone Has About Knockout Roses In Nashville: https://jvisecretgardens.com/knockout-roses-tennessee/
4. Knock Out Roses: The Basics: https://www.gardeningknowhow.com/ornamental/roses/knockout-roses/knock-out-rose-basics.htm
5. Knockout Roses: How to Plant, Grow, and Care for Knockout Roses: https://www.thespruce.com/how-to-grow-knockout-roses-1342693

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