2" Potted Plant. Known for its prominent lavender-blue flowers and broad, thick, glossy, ovate leaves that measure 4-8" across. Water hyacinth my wise above the serface of the water as much a 1 meter in height. The leaves float above the water surface and grow quickly in warm water. They have long, spongy and bulbous stalks. The feathery, greely hanging roots are purple-black.