[header] How to care for a midnight blue rose bush [title] Pick out midnight blue roses that look healthy. [step] Strong, healthy plants will be more resistant to diseases of all kinds, so the fight against rose disease starts at planting time. Select healthy rose plants that have sturdy-looking leaves and stems and don't show any signs of disease or pests. 
[substeps] Look to see if any of the leaves have black spots, red leaves, or chew marks. These are all signs of disease or infestation.