How is eucalyptus oil formed in eucalyptus leaves?

Leaves of the eucalyptus tree, which is native to Australia.

Yes: in Australia, "gum leaves" is the common term for eucalyptus leaves.

with the tender loving care that only comes with years of experience and patience

The Koala (Phascolarctos cinereus) is a marsupial mammal and is indigenous to Australia. Their closest relative is the wombat. They live in eucalyptus trees and eat only a few types of gum leaves...

No because Eucalyptus leaves are poisonous to every other living animal except for the Koala. I'm not sure if it is safe or not, but there is an overhanging eucalyptus tree that my orphaned lambs...