 The Park Seed Trial Garden provided a living laboratory where Park Seed Company’s research horticulturists compared the quality of industry standard plants with new varieties being offered by plant developers.Each year, Park Seed Company conducted trials on more than 2,000 varieties, all hand planted and tended.Trials run January through August for warm season annuals, October through February for cool season annuals, and all year long for permanent plantings of perennials.