Both grow in zone 10, but Simplicity now has black spot issues. Knock Outs bloom better, have fewer problems, but get very tall in warm climates.
Winter Mulching Knock Out Roses in Zone 5: Wood Chips vs. Pine Needles
Knockout vs. Nearly Wild Roses: Which Blooms More in Wisconsin?
Treating Powdery Mildew on Knockout Roses Naturally
Saving a Broken Rose Topiary: What to Do When the Stem Snaps
Transplanting Knockout Roses in Zone 5: Timing and Winter Protection
Pruning Knock Out Roses: Timing Flexibility in Raleigh, NC
Knock Out Roses Stop Blooming After Transplant: Normal Adjustment
Lacy Leaves on Knockout Roses: Sawfly (Rose Slug) Damage
New Knockout Rose Leaves Curling: Mildew or Fertilizer Burn?
Yellow Leaves on Double Knock Out Roses in Extreme Heat
Reviving Stressed Knockout Roses After Transplant and Drought
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