Cyperus involucratus or Umbrella Grass is an evergreen perennial with stiff erect stems that bear umbrella like leaf sprays atop.
Each leaf-like bract is thin and sharp edged with a spray of fine creamy flowers in summer that turn brown as they ripen.
This plant loves being at the waters edge and can even grow in a pool.
They go well in pots and planters, making a soft edge to sunny patios.