Scaly tree fern (Cyathea cooperi). This is large, fast growing tree fern native to Australia. This fern grows to 15 meters in height. The crown is widely spread and the light green fronds may reach a length of 7 metres. This is one of the most commonly grown tree ferns used in gardens and commercial landscaping. It is hardy and easy to grow. Topaz, Atherton Tablelands, Queensland, tropical northern Australia.