all at the low low con of being extremely flammable and reproducing best in brush fires. like a fair amount of california's native wildlife. certainly this is the best plan.
Why do you think I mentioned planting away from forests and dry fields?
I was acknowledging the flammability while giving some examples of how placement matters and the flammability risks can be mitigated.
Little things like keeping them isolated from areas dense in flammable plant life, not grouping them close together, and not planting in already relatively dry fields do make a difference.
Most importantly and here's something you should know if you read the Wikipedia article Do Not Plant In Draught Conditions Or Areas Prone To Draughts because they can literally lower a local water table fairly easily when in abundance and will make things dryer due to how much water their extensive roots tend to suck up.
"Some eucalyptus species have attracted attention from horticulturists, global development researchers, and environmentalists because of desirable traits such as being fast-growing sources of wood, producing oil that can be used for cleaning and as a natural insecticide, or an ability to be used to drain swamps and thereby reduce the risk of malaria. Eucalyptus oil finds many uses like in fuels, fragrances, insect repellance and antimicrobial activity. Eucalyptus trees show allelopathic effects; they release compounds which inhibit other plant species from growing nearby. Outside their natural ranges, eucalypts are both lauded for their beneficial economic impact on poor populations[49][48]: 22 and criticised for being "water-guzzling" aliens,[50] leading to controversy over their total impact.[34]
Eucalypts draw a tremendous amount of water from the soil through the process of transpiration. They have been planted (or re-planted) in some places to lower the water table and reduce soil salination. Eucalypts have also been used as a way of reducing malaria by draining the soil in Algeria, Lebanon, Sicily,[51] elsewhere in Europe, in the Caucasus (Western Georgia), and California.[52] Drainage removes swamps which provide a habitat for mosquito larvae, but can also destroy ecologically productive areas. This drainage is not limited to the soil surface, because the eucalyptus roots are up to 2.5 m (8 ft 2 in) in length and can, depending on the location, even reach the phreatic zone.[citation needed]"
And guess under what circumstances they become invasive! Can't figure it out?
"Several species have become invasive and are causing major problems for local ecosystems, mainly due to the absence of wildlife corridors and rotations management."
They are a group of plants that includes some species that require regular maintenance to keep them from becoming invasive.
Guess what California tends to be really bad at? Forestry management.
California is literally one of the worst places in the US for eucalyptus trees to be planted.