Treeferns (Cyathea Dregei), from which Treeferns Trout Lodge took its name, are found in several clusters in sheltered spots along the stream or near water. They flourish in a cool, moist climate, and are not easily transplanted. Normally they are evergreen, but in the higher, cooler regions the leaves dry to a dark almost black colour in winter, and hang downwards. In spring they sprout to a spectacular bright green umbrella. The trunks are erect, dark brown, and sturdy, 200 – 400 mm in diameter. They grow to a height of 4 – 5 m, and some are known to be very old. As they bear no annual rings, it is very difficult to determine age.