ID of plant

     stem of the plant

   top of the plant

This plant has grown for the first time this year and the stem is about 1.5m and then it spreads into leaves and little flowers.

Thank you, getting there, it's been quite a mystery.

Don't know the cultivar name but it looks very similar to the one that grew in the garden when I was a child. We used to call it  the 'mole plant' because, surprise,surprise it was supposed to keep moles away according to a local belief. It didn't. Yes, anyway, it is a euphorbia. Don't get the sap on you - it's nasty!

Hi there - looks like a "caper" spurge to me - euphorbia lathyris. The ones I have in the garden have leaves at regular intervals at right angles to each other. The "flowers"/bracts are pretty insignificant, in my opinion, but the bees seem to love it !! It's a biennual and has self seeded readily but not as invasive as other euphorbias that I have come across. Although a common name is caper it's NOT edible and care should be taken as mentioned with the sap etc - all parts of the plant, including the root are, I believe, poisonous. From memory I think that the seed pods once formed are "explosive" when pressed hence, can self-seed some distance from the parent plant. 

I'm not particularly fond of euphorbias but this is one which I do allow to grow in the graden !!