Now here comes the confusing bit :-)
mine love nettles (maybe a bit rich in new growth just now), and brambles, some would suggest using a goat(s) to help keep them down once hacked back?
Yes they'll kill any trees unless well protected, bearing in mind I'm convinced goats are related to giraffes, they'll reach anything!
I find the only thing that stops them climbing is an electric fence.
Foxgloves, buttercups, are more things that can give them upset tums, I've read that docks are supposed to be poisonous but mine make a beeline for them, A little doesn't seem to bother them.
Get rid of the hogweed, I think some are more dangerous than others but not worth risking.
Still wanting goats? :-)