'15719 GRW' is a new and distinct hardy herbaceous Hibiscus hybrid with novel characteristics that include upright branched stems, numerous, outward-facing, very light purplish-blue flowers, which can intensify to very pale purplish blue in response to high UV radiation, with a dark-red eye with an external halo of vivid red, a prolonged blooming season, and hastate, trilobed leaves.
