Cordyline Australis Green Palm Plant Extra Large Specimen 3ft Tall Supplied in a 5 Litre Pot. The Cordyline Australis Green is a superb outdoor hardy plant which gives that stunning tropical look without the big price tag! Cordyline Green is a superb hardy variety which has smooth long dark green leaves and forms a large woody trunk as it matures, growing to approx 10FT+ tall it is perfect for any garden large or small, can also be grown in large pots on the patio or decking, or either side of an entrance.