Sioux Crape Myrtle Trees grow 15-20' tall with decorative bark. The leaves of a Sioux Crape Myrtle change to spectacular shades of maroon and red in the fall. The bright pink flowers bloom best with full sun from July to October. The flowering of Sioux Crape Myrtle begins late in July and lasts well into October. The blooms of the Sioux Crape Myrtle Tree are pink in color and beautiful in appearance.