The article discusses a trial conducted by the Royal Horticulture Society (RHS) in London, England, on summer-flowering plant Phlox and its varied cultivars with an aim of categorizing it as a garden plant. It states that some of its cultivars were recommended for the Award of Garden Merit (AGM), depending on their surviving temperature and growing conditions. Topics include list of Phlox cultivars such as Phlox x arendsii ‘Utopia' and Phlox paniculata ‘Danielle' and Phlox maculata ‘Natascha'.