by 
The Curious Bag
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<h4 class="dechead">On One Hand: Are Resilient and Easy to Grow
Knockout roses are among the most resilient varieties of roses and are easy to grow. They have also proved to be very disease-resistant and can thrive in virtually any environment. For these reasons, knockout roses can be planted in almost any landscape combined with other plants to create the desired appearance.
On the Other: Shown to Favor Specific Conditions
Knockout roses have been observed to obtain optimal growth and maintain the most disease resistance in moist, well-drained soil that has a pH of 6 to 7. These plants also do the best when planted in areas that get no less than four hours of sunlight per day.
Bottom Line
Overall, knockout roses are easy to grow and can survive various environments and soil conditions. However, planting them in a setting that provides ideal conditions can promote plant health and further contribute to the knockout rose's ability to resist disease.
Source:
Growing Roses: How to Plant Knockout Roses
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