One of my inconsiderate neighbors* started growing stuff in the 6-foot no-man's land between our apartment building and the chain link fence.
Didn't ask anyone, let alone the managers.
Between this and that disturbance (listening to Rockies games, pounding in stakes, digging little irrigation canals, and what not,) he used a substance called, no kiddin', "Fox Piss" to ward off the little herb predators. Like wabbits.
It stunk to high heaven but it's apparently a real commercial product.
The high point for me, and the low point for him, was when all his watering made the retaining wall collapse --rumble-sploosh.
He got asked to leave. The unauthorized garden was only one of his many inconsiderate actions. He just had a tendency to go do what he wanted whenever he wanted.
However, it might work for you if you can find this stuff and your cornage is far enough away from your dwellingage.
EDITED TO ADD: Found it:
http://www.predatorpee.com/I guess they changed the name.
Terry, 230RN
* Senior citizen's apartment. Most of us have learned to be pretty considerate of others, because we were allowed by the Universal Spirits to graduate to "senior citizen" status. See, learning consideration for others is how come we survived that pre-senior citizenship training course. A lot of people don't make it through that classage.