Exotics as weeds

[Mr List]

Heracleum mantegazzianum has been reported as causing problems in parts of Huddersfield where I'm based. Probably the most dangerous exotic you'd happen to chance across in the UK.

http://webcache.googleusercontent.com/s ... clnk&gl=uk

shame as it looks great, massive leaves

[lee1125]

Not sure if its classed as an exotic but where i live Himalayan Balsam (Policeman's Helmet) has become a bit of a weed, there are thousounds of them naturalised on fields, footpaths, peoples gardens, i actually think its a nice plant and cant help but pop the seed head when they go to seed.

http://en.wikipedia.org/wiki/Himalayan_Balsam