Eucalyptus gunnii is a large shrub, which can grow to around 12m in height and makes a lovely tree, if you don't prune back. It's foliage is evergreen and slightly scented. New leaves are a lovely shade of blue, as they mature they turn grey, silvery and look very delicate, In summer, clusters of small whit flowers appear, which look great against the foliage. 

At a glance:

Evergreen foliage

White flowers appear in summer

Full sun

Well drained fertile soil

Hardy

Will reach a height of 12m and a spread of 8m over 10-20 years