For Koala Bears
Be aware they grow VERY LARGE VERY QUICKLY. Do not plant one of these near your house other than for a few years of summer bedding. On the other hand although they grow tall, I find that the canopy is not oppressive, letting in plenty of light enhanced by reflections of the silvery foliage. All you will need to complete the picture is a Koala Bear!
Germination of eucalyptus seed (most very small in size) can often be erratic and patchy, but on the other hand you don’t need many! If you see Eucalyptus trees in your local garden centre growing tall and above 4ft tall do not buy them, they are best planted young and small which gives them the best chance to develop a stronger root system. To my mind seed is a really good option, easy to raise for stronger plants and for a wider selection of varieties.