The hardiness of restios (Chondropetalum, Elegia and Rhodocoma) has been a question but experience is now suggesting that they are at least as hardy as Cordyline which is good enough for me. The crowns can be mulched in winter as an aid to hardiness and although the foliage may be scorched the crown will recover. Chondropetalum resembles a rush having upright stems, banded in black, while the others are all more feathery. Excellent for pot culture, but in the ground they are clump formers and not invasive [At the moment they are listed amongst the grasses, but I will get them listed together in the near future].
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