How to Grow Knockout Roses


Knockout roses give gardeners a no-fuss approach to growing roses, since deadheading is not needed. The cherry-colored blossoms display from summer into fall. Knockout is a disease-resistant shrub that can reach a height and width of 6 feet if not pruned. Introduced in the United States in 2000 by the Conard-Pyle company, knockout is cold hardy to USDA zone 4 and heat hardy to USDA zone 9. Plant knockout roses along the foundation or walkway, or as groupings in a landscape island for a colorful focal point.

Step 1

Choose a well-drained and full-sun location to plant knockout roses. Add 1 to 2 feet of space between the expected width of the full grown shrub and other shrubs or structures, like a house, for air circulation.

Step 2

Dig the hole as deep as the container is tall and twice as wide.

Step 3

Mix about 25 percent organic matter--like leaf mold, compost or peat moss--into the removed soil.

Step 4

Remove the knockout rose from the container and place it in the center of the hole. The graft (a bulge on the main stem) should be about 1 inch above ground level in the south, including USDA zones 6 or higher, and about 1 inch below ground level in the colder USDA zones, including 5 or lower. Adjust the amount of soil in the bottom of the hole if necessary.

Step 5

Backfill the hole halfway with amended soil. Water around the shrub to settle the soil and then finish backfilling the hole.

Step 6

Apply 2 to 3 inches of mulch, like pine chips, around the knockout rose shrub, keeping the mulch about 3 inches from the stem of the plant.

Step 7

Water every seven to 10 days if there is no rainfall.

Things You'll Need

  • Shovel
  • Organic matter
  • Mulch


  • University of Florida Extension: Knock Out Roses
  • University of Texas A&M Extension: Earth-Kind Roses, Knock Out
  • The Conard-Pyle Co.: How to Plant a Knock Out Rose
Keywords: grow roses, flowering shrubs, knockout roses

About this Author

Barbara Raskauskas is a certified e-learning specialist and certified Microsoft Office specialist. She has written web content, technical documents and course material for a decade. Raskauskas now writes how-to's, product reviews and general topics published on several websites, including Demand Studios.