Juncus inflexus ‘Blue Medusa’ Rush. 'Blue Medusa' is a true rush known for it's upright curled foliage similar to Corkscrew rush but with thicker leaves and a hazy blue-green color. 'Blue Medusa' grows in blue-green clumps just over 1' tall in full sun to part shade and shallow water. It will tolerate moist soil as long as it doesn't dry out. Flower is inconspicuous. This unique plant is perfect for adding a unique spiral texture to just about any arrangement of plants. Hardy in zones 5-11.