Been told that Eucalyptus can spark up to 7 miles...makes it a hard fuel to deal with. And they tend to get hollowed out with age and blow up real good in wild land fires...
Eucs are basically designed to feed Koalas and spread wildfires. Here (No. CA) they are considered weeds. You may note the rabid exception in the Walnut Creek tree regs I listed earlier excepting “Blue Gum” trees. You cut down some number of Eucalyptus trees and they will channel Barbara Boxer into your chainsaw, and two hairy Berkeley graduates will come and interview you on videotape about your work with non-native species for the local community access channel. After the interview, they’ll ask for a group hug and invite you on a whale-hugging biodiversity expedition.
Los Angeles county schools finally started removing the exotic Eucalyptus on their grounds when it became apparent that mature limbs would just drop off without the slightest provocation; children had been struck by falling branches.