How to Plant Double Knockout Roses

If you want to know how to plant double knockout roses, it pays to know a little about the plant. Knockout roses were developed by rose breeder, Bill Radler in 2000. In 2004, Radler introduced the Double Knockout rose, which has a fuller bloom and is slightly more winter hardy. Knockout roses are well known for their beauty, robust growth and disease resistance.

Planting Double Knockout Roses

Knockout roses are forgiving plants. With a bit of forethought and care, your Double knockout roses will give you years of trouble free beauty. Here's how to get them in the ground:

  • Your roses in the landscape. For the healthiest plant, look for a location that is in full sun and has well drained, organically rich soil. Double Knockout roses prefer soil that is slightly acidic, with a pH of around 5.5 to 6.5. Adding peat moss or pine bark mulch will help lower the pH of your soil. You'll want to plant these beautiful rose bushes in groups of three or more with a spacing of about three feet.
  • Dig the hole. Once you've decided on a location for your Double Knockout roses, did a hole that is as deep as the container and twice as wide. Mix some organic material (manure, peat moss, etc.) into the soil that has been set aside.
  • Prepare the plants. If the soil in the containers seems dry, water it a bit. Remove your Double Knockout roses from their containers and loosen the roots if they seem bound tight.
  • Place your plants. Center your rose plant in the center of the hole. From zones 6 and south, the bud union (that knobby part near the base) should be about one inch above the surface of the soil. From zones 5 and north, the bud union should be buried about an inch under the surface.
  • Just add dirt. Backfill the amended soil around the plant. Press the soil firmly into place to remove air pockets.
  • A healthy finish. Water the plants well and add additional soil if the plant looks like its sinking below the surrounding ground level. Add mulch to help your Double Knockout roses retain moisture.
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