There are a wealth of truly incredible herbaceous plants that can be grown in the UK with massive foliage and stunning exotic-looking flowers such as bananas, gingers, and Cannas. They can be planted in their pots until winter when they can be lifted and placed in a frost free greenhouse or shed. The other option is to plant them in the ground and give them protection in situ - as illustrated below - but this is best done after a light frost has blackened the foliage which generally will trigger dormancy.
Cannas and Gingers are best protected by cutting them back to a few inches above ground and then covering with a layer of straw or good compost to a depth of at least a foot or more in colder areas.
Hardy bananas can be treated in the same way but if you want to keep the height gained over the growing season the trunks will need to be protected as illustrated below. Please bear in mind that there are many variations for wrapping plants for the winter and the directions given below are just for guidance - feel free to be as creative as you like!