Cordyline Terminalis

Hi Madpam. I just checked in my RHS book and I'm afraid that this plant is not frost hardy. So the answer to your question is No, it can't grow outside in the UK.

Cordylines can grow outside in the UK. BUT they need to be grown in your sunniest spot. Much depends upon your own location irrespective of county. You have to experiment.

To improve your chances it's best to grow your plant under cover to increase the size of its root stock. Once it gets big enough to distort your bucket plant it out once all threat of frost is over to give it its best chance. Then cover with frost fleece for its first winter.