Do they smell good, sure and is their oil good as a repellent, yes but look below this tree and see how it suppresses all native species which support the native wildlife in our diverse ecosystems in this country.
I worship the diversity of trees and habitats this United States contains. They are already threatened enough by the hand of man. Imagine my horror to receive this email petition from Forests.orghttp://forests.org/shared/alerts/sendsm.aspx?id=frankentrees
If you love our endangered forests and trees as much as I do please sign this petition at the above link.
Here are some reasons why.....if you have seen the ubiquitus eucalyptus of California they are not native.
Some Eucalyptus species have attracted attention from global development researchers and environmentalists. Such species have desirable traits such as being fast-growing sources of wood, producing oil that can be used for cleaning and functions as a natural insecticide, or an ability to be used to drain swamps and thereby reduce the risk of malaria. Outside their natural ranges, eucalypts are both lauded for their beneficial economic impact on poor populations:22 and derided for being invasivewater-suckers, leading to controversy over their total impact.
Plantation and ecological problems
Eucalyptus was first introduced from Australia to the rest of the world by Sir Joseph Banks, botanist, on the Cook expedition in 1770. It was subsequently introduced to many parts of the world, notably California,Brazil, Ecuador, Colombia, Ethiopia, Morocco, Portugal, South Africa, Uganda, Israel, Galicia and Chile. In Portugal and also Spain, eucalypts have been planted in pulpwood plantations. Eucalyptus are the basis for several industries, such as sawmilling, pulp, charcoal and others. Several species have become invasive and are causing major problems for local ecosystems, mainly due to the absence of wildlife corridors and rotations management.
Due to similar favorable climatic conditions, Eucalyptus plantations have often replaced oak woodlands, for example in California and Portugal. The resulting monocultures have raised concerns about loss of biological diversity, through loss of acorns that mammals and birds feed on, absence of hollows that in oak trees provide shelter and nesting sites for birds and small mammals and for bee colonies, as well as lack of downed trees in managed plantations.
In seasonally dry climates oaks are often fire-resistant, particularly in open grasslands, as a grass fire is insufficient to ignite the scattered trees. In contrast a eucalyptus forest tends to promote fire because of the volatile and highly combustible oils produced by the leaves, as well as the production of large amounts of litter which is high in phenolics, preventing its breakdown by fungi and thus accumulates as large amounts of dry, combustible fuel. Consequently, dense eucalypt plantings may be subject to catastrophic firestorms. Eucalypts obtain their long-term fire survivability from their ability to regenerate from epicormic budsand lignotubers, or by producing serotinous fruits.
And here is some more information from Forests.org