Blue Box Gum is a medium sized tree that will reach a height of 15 metres. The bark is pale grey, fibrous and flaky. The foliage are oval and five to ten centimetres long by four to six centimetres wide. They are bluish-green in colour. Flowers are white to cream, 1.5 centimetres across and are both conspicuous and profuse during the flowering period in November and December.