My California is the smell of eucalyptus trees in ocean air. Even salted essential oil can evoke for me whole swatches of my childhood: My father in his crazy wigs, my grandparents’ conch-shell silences on the Carmel beach, the thick grove where I got lost behind my schoolyard collecting the trees’ bell-shaped silver pods.

Imagine my surprise when I learned that eucalyptus is nonnative to California—“invasive” even though they didn’t ask to come here. They arrived in the late 1840s and early 1850s with prospectors from Australia—those Gold Rush days brought an onslaught of mostly European-American and Chinese immigrants that would triple the state’s population in the space of a few years.

Now my local newspaper prints detailed instructions on how to kill the invasive eucalyptus.

I am also invasive.