Posted: 05/06/2013 at 21:50
If it's reasonably bright Phormiums do well in pots and get to a good size especially the bog standard common ones, and there are plenty of hebes which will grow happily in pots- 'Buxifolia'-as the name suggests - is like box with some pale lilac flowers in summer. I had it in a pot at front door of a previous property and it thrived on neglect. Makes a nice rounded shape with no maintenance. There are shrubs such as rhodies, azaleas and pieris which will be happy in pots - ericaceous compost for them. Fatsias look tropical and get to a fair size- these all prefer a bit of shade. Conifers- too many to name here. All evergreen.
Grasses in tall pots will work too - festucas and many carexes are evergreen. You can add other seasonal interest with bulbs in containers in front of the evergreens.