A new and distinct cultivar of Gardenia plant named ‘；RLH-GA1’；, characterized by its compact, upright to outwardly spreading and mounding plant habit； moderately vigorous growth habit； freely branching habit with short internodes； dense and bushy appearance； plants require minimal pruning； flexible lateral branches that resist cracking and splitting； relatively small and dark green-colored leaves； color is maintained during the winter and under low and high light conditions； freely flowering habit with flowering continuous during the spring and early summer； strongly fragrant single white-colored flowers that become yellow in color with development； and excellent garden performance and temperature tolerance.
