Check out 44 Best Shrubs for Containers. You might know some plants and some may surprise you but one thing is sure- Youll like to have some of these shrubs right away in your container garden.: - Garden Tips and Tricks
Love these giant bromeliads I was thinking about as features they would definitely add interest but not sure whether they would work in the UK climate. The giant ferns in the background (if that is what they are) also add interest.
Boxwoods - Spectacular Container Gardening Ideas - Southern Living - Potted boxwoods offer formal elegance with little maintenance. This large American variety creates a living wall in a line of concrete planters.
Our set of two Katie Planters features a latticework of raised dot detailing, for just a touch of texture. In a sleek, vertical silhouette, they look great placed together, or among other planters for a dimensional high-low landscape.