These perennials, from left, are agastache, phlox and aster. Photos by Connie Oswald Stofko by Connie Oswald Stofko I like gardening quizzes because they’re fun. If you get the answer right, you feel smart. And if you don’t know the answer, you learn something new. See the answers and explanations below the questions. 1. What is the deadline for planting perennials in WNY? A. Memorial DayB. June 15C. Middle of September 2. What is the best way to water your…