Shhhhh! Hush, Landon! This kind of activity is frowned upon by customs inspectors, ag officials, and all manner of petty bureaucrats. They point to a couple of invasive species and start spinning tall tales about people getting swallowed by kudzu and fed to the walking catfish.
If you are going to be a latter day Johnny Appleseed, you need to do it person to person, maybe through a place like
Couchsurfing, with discreet offers to help with the garden.