Many of us live in places where alien invasive species are raining havoc on native species and agricultural crops. The camp fire wood transport prohibition is an example many of us are familiar with.
We love a bit of lime to put in our rum drinks and are almost always frustrated by the lack of them in Jan/Feb so next year, I'll just bring a plastic lime shaped dispenser of lime juice! Our friends have a sour orange tree in their yard that offers a local alternative and they make a mean margarita with them! Respect the ecology! --Marblehead