Coin spot tree fern (Cyathea cooperi), sometimes called lacy tree fern, is a fast-growing, semi-hardy species of tree fern native to Australia. The fern thrives in the cool, moist environments found in Sunset's Climate Zones 15 to 24, where it will reach an ultimate height of 20 feet under ideal conditions. Coin spot tree ferns require little care once established if humidity is high and the soil is moist and rich. The ferns are somewhat susceptible to cold damage if temperatures drop below 20 degrees Fahrenheit, so it is best to grow them in a sheltered spot. Grow coin spot tree ferns in a sheltered bed with dappled shade and moist, mildly acidic, free-draining soil. Amend the soil with a 6-inch-thick layer of well-rotted manure worked into the soil at a depth of 15 inches.water it regularly. pCoin spot tree ferns will grow in full sun in Sunset's Climate Zones 15 to 17 if you protect them from drying winds and salt spray, but partial shade during the hottest part of the day is best.

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