I am something of a novice gardener and am looking for suggestions as to smallish trees/large shrubs that are fairly quick growing and that I could grow in large tubs to be placed in an open, sunny courtyard, sheltered and no frost.

I was wondering whether perhaps citrus or frangipani might be suitable or whether someone could offer some other suggestions?

I have managed, somehow, to keep alive 2 large Benjamin Figs (I think that's what it is ) in big tubs on wheels and I would love to have a few more plants of a similar size and robustness but different varieties. I find it very useful to move them around for shade, screening etc.

However, I am far from expert at gardening and would appreciate any suggestions or advice. Like all new gardeners, "quick growing and easy care" are my watchwords !

Thank you