Eucalyptus viminalis is a straight erect tree, to around 40 metres, with a rough bark that peels away in long ribbons Widely distributed in the cooler areas of Australia where the leaves are the favoured food of Koalas as the sap has a 5â15% sugar content. have seen it mentioned to use as a herb on food but Eucalyptus oils can be mutagenic and it would not be my advice to use it this way. On the plus side and quick from seed it will make an excellent highly lemon scented patio pot plant for the summer with long lance shaped bright green leaves.