The Berkshire Botanical Garden’s 47th Annual Plants-and-Answers Plant Sale will be held on May 10 and 11. Curated by BBG’s horticulture staff, this year’s Plant Sale features hundreds of perennials, annuals, and vegetables, with a focus on diversity and nature-based landscaping, a trend toward gardens that are exuberant and alive, out of the uniform and into something comfortable, and welcoming to birds, bees and butterflies.