As I surround myself with rose catalogs and make my final decisions about this year's purchases, I can't help remembering all the roses I have bought and killed.  When I was a new gardener I was ashamed of every failure and knew, rightfully so,  that it was caused by my lack of knowledge and skill.  It took time to realize that knowledge and skill grow from our failures.  We learn about proper planting, proper siting, and proper maintenance.…