Did you know that almost all of the plants in the Arboretum begin their lives in the Dana Greenhouses? Get a behind-the-scenes look of the greenhouse growing process, from seed to sprout to seedling to tree. Meet at the Bonsai and Penjing Collection above the Leventritt Shrub & Vine Garden. There is a 14 person maximum.Free, registration requested and limited. Register online at my.arboretum.harvard.edu or call 617-384-5209.