We have a lovely big patch of land that we plan to turn into a veggie patch. Unfortunately, we've suffered with trespassing & vandalism with much of the work we've done so far. We are lucky enough to have inherited a polytunnel frame (a large hooped structure to be covered with plastic for use as a commercial greenhouse) but our last attempt to get a cover on it ended 10 days later when a knife was taken to it. We also get stones thrown over as well as actual trespassing.
We'd like to get cracking again this year (warm weather is best for working with the plastic cover) & are concentrating on getting an earth bank & fence installed beforehand, to minimise any issues. We'll be planting a hedge along the top of the bank, but that will take a while to grow. This work will also involve doing some terracing, so the ground level at the boundary will be about 1-1.5m/3-5ft higher than the main area. It is also on the northern (sunny) edge, and the whole boundary is about 25m/45ft long. We are located out on the west coast of Wales, so have a temperate climate & moderate wind, but can't construct anything that might upset the officials as we're in a National Park. Saying that, the boundary can only be seen from either our land or from our vandals', sorry, neighbours' land.
We're not thinking of bear traps or anything, just wondering if anybody has any suggestions for things that would be useful & practical that might also cause an added obstruction. The instructable on the Double-Decker Drum Composter inspired me to think about other possible options, though I'm not sure whether composters would suit the sunny location. Please note that this will be a veggie patch, so nothing that might cause issues with growing and (more importantly) eating our own produce.
And no, nothing can be proved but would only cause more hassle even if it could, so we just have to find other, less confrontational, ways to work around these things :)
All (sensible) ideas are very welcome!