I don't know what your setting is, but in my case when we clear brush, we stake it where we intend to block a passage way for the deer to the orchard, instead of burning it. These fence like piles, which are generally good for a few years only, unless you keep adding to it, is impenetrable especially if there are trees and standing brush at each end. It forces even deers to change habits and if the ATV drivers change habits, then possibly it will be for good.
Poison ivy usually grows by water and beside it is generally known that ATV drivers don't admire the paysage long enough to recognize it. I can appreciate the intention though!!? :)
The trouble with roses and other live natural fencing is that it takes some time to get established and while being a deterrent for pedestrians (the sunday types and the bikers, especially if wearing shorts), it is not a challenge for motorized vehicules.
Put up a sign against trespassing. Some categories of ATV are licensed and are not supposed to trespass on private property. With a sign, you can challenge them and they cannot claim that they though it is OK, which is generally the first response...
Another approach would be to allow them to pass in one area only, if they must pass to avoid a big detour as it is always better to get along if the people are to be the reasonable kind. Can you see the spot from your house? Was the habit established before you bought this place, or did the problem developed after you moved in? Is it always the same people, or are you located in an area where there is a lot of one time visitors? If there is a will to pass through, then I don't think natural fencing is the solution.
Hélène, zone 3
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