When grown in containers, roses prefer bagged potting soil. "Preparing your garden bed with 2 to 4 inches of compost mixed in will give your Knock Out roses a great foundation to grow in,” says ...

Add easy-to-grow 'Knock Out' roses (Rosa 'Knock Out') to your garden for beautiful blooms all season. Fact checked by Emily Peterson Reviewed by Julie Thompson-Adolf As one of the longest-blooming ...