Hello Gary,
There are plenty of plants that you can grow in tubs to help wild birds. Here is a list from the RSPB. Most of them are shrubs, which would require a little extra care if confined to a container. Be sure to water, feed and top-dress them regularly, and repot as they grow. The daisy family is a good recommendation - there are plenty of attractive daisies that will grow well in pots. Also have a look at our features on helping birds in the garden on the site.
Good luck, I hope you soon have lots of feathery friends flocking to the courtyard,
Emma
gardenersworld.com team