Hi Andy,
At the time we planted the pond I didn't think keeping track of the name of plants was important. Now I wish I had.
By looking at pics on the internet, I believe the clump of grass you are talking about might be Maiden Grass (Miscanthus sinensis 'Gracillimus'). I have seven different grasses but don't know their names.
There are also seven Sungold Cypress planted around the pond, mugo pines, burning bushes, rumba and java red weigela, little princess spirea, lilacs, dbl file viburnums, Canadian Hemlock, Dogwood and a Snow Weeping Cherry. For perennials I have Autumn Joy Sedum, Black-eyed Susans, Purple Coneflower, Daylilies, etc. The stream is planted with Watercress, Blue-Forget-Me-Nots and a couple other things I can't remember the names of. In the water the big leaf plant is Spatterdock or Cowlily, iris on the left of the waterfall, mint, water celery, lizard tail, and more. I can't remember whats out there until everything greens up.
Things get pretty bare around here in the winter. I like a big assortment of evergreens, grasses, sedums and bushes to add some winter interest. I will post a few seasonal pictures to give you an idea.
Joyce, I love the Golden Hakone Grass. Think I need some of that.
Also love your Pondsai. The colors and textures are so eyepopping. I need to find some of those little toadstools (mushrooms), like them too!!!
Karen