Posted: 19/08/2014 at 12:05
It is getting a bit late to plant alot for colour now, try a local garden centre and see what they have in the way of bright annuals for the end of the year. Later, put little bulbs in it for Spring joy, scilla biflora for example, tiny daffs maybe.
Bright colours over the next few months are unlikely, once the first frosts come - and this year it looks as if they may be early - the brighter colours are over. There are pretty coloured leaves, heucheras for example, the little bulbs will push up through them in the Spring.
Try not to use very small containers, they hold only a small amount of compost so dry out easily ad haven't got alot of food for whatever you grow in there. Also they will freeze solid earlier than bigger containers, though most, whatever the size, will freeze eventually.