Where my neighbours drive meets mine there is an area of soil
approximately 18 inches wide 50 feet long. There are four original
1950's concrete boundary posts on this area with a hole in each to mark
the boundary.

I am not a keen gardener although my neighbour is. I keep my side of the
boundary free of weeds and cleared because my drive slopes towards it
for rain run off.

My neighbour last year decided to "dig over" his and my side without
notice and then grumbled when I then dug into my side to form a small
trench for the rain.

My neighbour plants (cheap) flowers along his side and just leaves them.
These spread leaves/flowers to my side which I prune back to the border.
If I let his flowers grow my side without pruning, he may assume
(wrongly) that he can do whatever he likes with this area in future !

I also feel that he would not be pleased if the situation were reversed
and I planted some large flowers that encroached on to his side.

Would other readers of this group let the neighbour do what he likes
with the border, or take the the limited action that I have taken to
keep my land mine !

Martin.