I just planted four eucalyptus trees and the leaves have started curling up.
Leaves Curling Up
Certified GKH Gardening Expert
This is not normal. It may be that the plant has some air pockets around the rootball that were not filled in correctly when the plant was put in the ground. Step firmly around the base of the tree to try to collapse these air pockets. Also, water the plant quite a bit as this can also help to fill air pockets in.