(Wonderful work sir)-:oin 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.
Water coin spot tree ferns deeply and regularly. Trickle a garden hose at the base of the plant for 10 to 15 minutes every seven to 10 days. Increase water to once every three to five days during periods of hot, dry weather.
Mist the foliage and trunk daily during the summer to keep it from turning brown. Use a garden hose with a mist nozzle. Spray mist into the air above the tree fern and let it rain down. Pay special attention to new, young fronds because they dry out easily.
Prune off and discard damaged, dry or dead fronds. Snip the frond off at its point of origin using pruning shears and place it in a green waste can. Do not compost or mulch fronds that have died for unknown reasons because they might harbor bacteria, fungi or other pests. Wear long sleeves when pruning the tree fern, because the hairs on the fronds can irritate the skin.
(Source)-:https://homeguides.sfgate.com/grow-coin-spot-tree-fern-25153.html.