If you can get a very large container, you could try something like an Ornamental Pear tree like Pyrus Calleryana 'Chanticleer' or Weeping Pear Tree, Pyrus Salicifolia Pendula. There's a row of the Ornamental Pear trees growing in troughs around 1 metre by metre on the estate where I live. They seem to be doing well.
Something like the Mount Edna Broom, Genista Aetnensis would also look nice in a large container. Lovely scented flowers in early to mid summer and a graceful habit with almost evergreen leaves, I think they will do fine in a container for a while.
I regularly pass some photinia red robin that are trained to grow as trees rather than shrubs in large containers and they seem to look good all year round. I think laurus nobilis (bay laurel) can also be grown successfully in containers.
Take a look at Prunus Kojo-no-mai and see what you think. It’s doesn’t get too big, has great spring flowers, a tidy form and slow growing. Just make sure you buy the largest specimen possible, as after 4 years my foot tall has grown to two feet in a pot.
How about a variety of Chaenomeles lots of lovely blossom and shouldn't be difficult to keep happy in a large pot. Also a Cercis Chinensis aka Chinese Redbud, lovely early spring flowers and wonderful autumnal colour.
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Something like the Mount Edna Broom, Genista Aetnensis would also look nice in a large container. Lovely scented flowers in early to mid summer and a graceful habit with almost evergreen leaves, I think they will do fine in a container for a while.
Thats like a budgie in a cage............. it should not happen.