PORTLAND (WGME) The next time you visit the Coastal Maine Botanical Gardens, some very large guests will be there to greet you. There are five tall trolls spread out around the gardens. They're the Guardians of the Seeds, and they carry a message on sustainability. The Guardians of the Seeds exhibit is now open at the Coastal Maine Botanical Gardens. (WGME) "Planting seeds, saving trees, talking about stories, going outside more.