I've used Lovage (wild Celery) as a cover scent, seems to work in those spots you can't use the wind.

You can start a plant, spit the roots to propagate it after it matures or spread the seeds. Pretty hardy perennial once it gets established. I have a small plot in the home garden and have spread it around on my lease. Also a nice herb to mix in salads or soups.

We call it Hog catnip. Few Hogs around here that don't smell like Lovage.