15173 GR' is a new and distinct hardy herbaceous Hibiscus hybrid with novel characteristics that include upright branched stems, numerous, outward-facing, flowers that exhibit a background that is between moderate yellowish pink and strong pink in the mid and upper part, and between vivid reddish orange and deep yellowish pink from the middle part down to the edge of the center eye, a strong red center eye, a prolonged blooming season, and hastate, trilobed leaves.
