What to plant in my pot?!

Hi! I'm sorry to have to ask but I can't think of anywhere else to do so! I'm relatively new to gardening, so my knowledge is lesser, rather than greater.
My quandary is this: I have a redundant pot that is 1ft wide and 1ft deep (30cm x 30cm in new money!). I would like a small tree (if possible) that is beneficial to all wildlife, particularly for the bees, for as much of the year as possible. Or if not a tree, a fair-sized shrub that would be happy in this sized pot, along with the care I would give it. I would dearly love to plant one in the ground but it's not possible, unfortunately. I realise this is rather a broad subject but I really would appreciate any thoughts from you. Many thanks in advance.
My quandary is this: I have a redundant pot that is 1ft wide and 1ft deep (30cm x 30cm in new money!). I would like a small tree (if possible) that is beneficial to all wildlife, particularly for the bees, for as much of the year as possible. Or if not a tree, a fair-sized shrub that would be happy in this sized pot, along with the care I would give it. I would dearly love to plant one in the ground but it's not possible, unfortunately. I realise this is rather a broad subject but I really would appreciate any thoughts from you. Many thanks in advance.

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