>>63956821
>>63956846
The fanleaf hawthorn makes a pretty decent fence, too. It can be planted densely enough that the branches tangle together, making it quite difficult to force out of the way, and they're covered with inch-long thorns so anyone attempting that is likely to end up cursing, screaming and/or injured.
It's pretty common in Northern Europe, but I think the fence variant was originally imported from Ontario. Doesn't mind the cold at all, grows at least to a man's height up to Lapland. It can die if voles gnaw the roots, though.