WALTHAM - First impressions of the Lyman Estate Greenhouses change with the season. In fall, large jasmine are moved indoors, adding their scent to citrus beginning to bloom. The air becomes a sweet cocktail of kumquat, lemon, lime, orange, and pineapple until March. By Halloween, early cold Dendrobium orchids sport vivid pink and purple flowers. In spring, peach Cymbidium orchids ......