Can I force my mailman to stay on my cement path?

Don't mess with the mailman, I did, regretted it.

You will have to change your landscaping to make it unpleasant to him to take that path.

First politely ask him to stay on the path. If he doesn't then you'll have to call his superior and/or put up some sort of barrier like a railing to keep him from going that direction.

Get some stones for him to step on. That way you can point out your attempt at compromise when you photogragh him failing to comply.Hope for the best but but money on the worst when dealing with humans.

Codger is right about the berberis(barberry), their spines break off and stay under the skin and get infected so easily. There is a variety...Korean I think...that has more numerous, longer spines.

They will do this to save time and steps on there route. But if asked not to walk on you lawn or plants in your case then they will or are not suppose to walk there any more. Just ask him/her to use the walk from now on but do be polite.

First try asking him politely to stay on the path. If that doesn't work, then plant some poison ivy in your yard.

They sell a motion activated sprinkler to keep deer etc out of gardens. After he gets doused explain something has been trampling your garden and never thought it was him.

Roses , Berberis and Pyracanta mixed border will work a treat.

Manure or Manure Smell in the area

You can ask him or her to stay on your cement path, but you can't force him or her to do it.

i would ask him nicely to go around the plants, but you dont really wanna piss off your mailman, that could suck.

You can put up string with stakes.