
Quoting
MiddlePart
To more specifically answer your questions:
1) if (as you wrote) there is no local regulation or HOA requirement prohibiting planting a garden near a neighbor's fence, then, yes, you are allowed to do it.
2) your neighbor would probably have a difficult argument claiming damages for discoloration insofar as that is the sort of thing that will happen to white fences generally without any wrongdoing by anyone else. This is particularly true where your actions (placing the garden near the fence) were probably lawful (see answer to Q1), and it is not likely that you undertook those actions with any intent that the result would be discoloration of the neighbor's fence. When a matter goes to court, it is always possible to get a screwy result, but it seems unlikely that a court would find you legally responsible for discoloration of the fence in these circumstances.
3) No, your neighbor would not have any legal right to damage your plants or your chicken cage even if the neighbor honestly believed the plants or the cage (or both) might end up adversely affecting his fence. His lawful option in those circumstances is to wait until the damage actually occurs and then bring appropriate legal action against you to recover for his losses and, perhaps, require you to relocate the garden. Whether he would win such a case is unclear (see answer to Q2).
Also -- if the neighbor did pre-emptively damage your property, you would have a civil claim against him to recover the value of the loss. The neighbor's action probably would also constitute a criminal offense, although under the circumstances the police may choose to not get involved. Still, calling them again should it happen again might help send your neighbor a useful message even if the cops decide to only issue a warning (as opposed to, say, arresting the guy or issuing a citation).
4) "Is he 'trespassing' by reaching our property from over the fence?" Possibly. The relevant Florida statutes are found in Title 46 (Crimes), section 810 (Burglary and Trespass). You'd particularly want to look at sections 810.08 and 810.09, and the definitions in section 810.011, and any published Florida court cases interpreting and applying those statutes.
The text of the statutes can be accessed from (among several other places), here:
www DOT flsenate DOT gov/Laws/Statutes/2019/Chapter810