Mystery Plant ID

[AlexH]

Hi everyone,
Anyone know what plant this is? Would like to prune it or clean it up to make it healthier but I don't want to do the wrong thing. Knowing what plant it is I could learn it's preferences. Thanks

 

[cpp gardener]

Probably Euphorbia characias or E. wulfenii, both known as Mediterranean Spurge.

 

[Tetters]

Alex, this plant bites like a redback! I strongly advise wearing gloves when tidying it up. The sap inside can bring you out in weals. I grow loads of them, all different varieties, they are pretty tough and worth having as long as they get the respect they command!!