Polystichum Tsus-Simense | Korean Rock Fern (S)The Polystichum tsus simense, known to some as The Korean Rock Fern boasts glossy green fronds, black stems, and a pinnae thats oblong and spiny toothed. In other words Dwayne looks freakin perfect. Keep him inside and he'll stay fresh as a daisy, lush through the seasons but put don't hesitate to put your Rock Fern outside in spring and summer. As long as your garden patio isnt too wet orstone cold!