I was thinking about this for another thread, and I figured I'd post it here, too.
If you have this stuff as a border on your property, do NOT plant food bearing plants where they would be accessible from the outside of your property. It would only encourage the hungry wanderer to investigate further as he tries to forage for food off your "fence". If you want to screen the view of your location as well as deter intruders, having anything that would invite closer proximity would also invite closer inspection.
Along a roadside, I'd plant native nasties- in my area, that could be any of a variety of prickly bushes, and let them just go nuts. Behind that, plant some trees like conifers- which retain their foliage year round. Not only would they act as a vision barrier, but also as a windscreen, saving you money on heating bills. On the INSIDE of the border, I'd consider the berry bushes, as a second layer of nasties, and as a food source you could probably harvest from without being seen from the other side.
Having the conifers swapped out for a thorn bearing tree would be good for security, but it rarely happens in Nature to have a self-protecting tree surrounded by self protecting bushes. Also, thorn bearing trees (in my AO, I'm not aware of any others) don't keep their leaves year round- you'll get mulch for the pricker bushes, but at the cost of visibility. Combine natural items with things they'd normally be seen with in the woods, don't plant the trees uniformly, and it will look much more natural, affording camouflage as well as security.
silentpoet wrote:My first two warning shots are aimed center of mass. If that don't warn them I fire warning shots at their head until they are warned enough that I am no longer in fear for my life.