This word (which, if you lisp, will make you spit) commonly refers to plant life because it means falling off – i.e., deciduous leaves. You can even use this adjective to refer to the entire tree if it seasonally sheds. However, the term can also mean ephemeral, as in lasting only a short time. Since most people do not ever use it like this, you might see a few blank stares or puzzled faces if you choose to do so.
Example: Vicky thought that her client’s backyard harmonized with the home’s architecture perfectly, but she disliked the impracticality of millions of leaves accumulating in every nook and cranny due to prevalence of deciduous trees.