The Berkshire Botanical Garden is one of the jewels of the Berkshires. This summer it is sparkling more than ever. In addition to the regular plantings of trees, shrubs, perennials and vegetables, the Garden is hosting several special exhibits this year. I was particularly taken with the display of garden sheds. Five fantasies consisting of standard pre-fab garden sheds are arranged around the Garden grounds. Naturally I was delighted with the Garden Blogger’s Retreat designed by Michael…