15714-1N' 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 in response to high UV radiation, and a center eye that is between dark red (RHS 59A) and deep purplish red (RHS 59B), with the outer part of the eye moderate red (RHS 185B), a prolonged blooming season, and hastate, trilobed leaves.