Umbrella palm or a close relative of Papyrus this normally zone 9 (20ºF) perennial ia a sepanding clumps. lection that weathered 0ºF and lived, hence the name. Tall perennial for perpetually moist soils or shallow water in ponds. Also very useful in container water gardens. To 4′ tall the slender green stems sport an umbrella top of leaves. The radial leaves become decorated w/ small brown flowers in midsummer. This indeed has been very hardy for us. We’ve never lost it to cold. Easy to grow wetland plant that demands a lot of irrigation in open ground. The first hard freeze takes it down half way and by the end of winter is is usually completely deciduous. Returns in mid-late spring with real heat. Full sun- very intolerant of shade. Forms a compact but slowly expanding clumps. Very easy.