How Big Are Knockout Roses?

What is the Average Height and Width of Knockout Roses?

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?

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