Natalya Zahn’s Birds and Bees and Tulip Trees illustrates the relationships between North American plants and their pollinators. The Tower Hill opening reception and gallery walk for this Boston area artist will be Saturday, August 8, at 1 p.m. The nonprofit Tower Hill Botanic Garden is located at 11 French Drive in Boylston, Mass. For more information, visit towerhillbg.org or call 508-869-6111.