SEEDS: Jeff Manson, a loyal Larner Seed employee, hosted visitors last Sunday on two colorful tours of the Larner Seeds California Native Demonstration Garden. As part of California Native Plant Week, Larner Seeds and the Marin Chapter of the California Native Plant Society invited guests to West Marin to witness its wild and blooming spring beauty. The tours, book-ended with native-plant-based snacks, meandered through vibrant pathways and offered native plant identification, anecdotes about plant behavior and a guitar-accompanied song about differences between cultivated and wild forms of native plants.    Katie Haberman