If you are sated with garden catalogs that came in January, but still haven’t made all your 2017 choices and plans, you are probably ready to hit garden centers and nurseries. There you will face ranks of captivating and irresistible shrubs and perennials. No matter how alluring the plants it will be worthwhile to read the labels, and think about your garden spaces before you buy. I have had gardeners tell me about their failures and disappointments, asking …