Fruit trees why no fruit produced?

reasons for non fruit? i planted 4 fruit trees in june last year apple/plum/pear/cherry all in pots,they produced foliage last year but no fruit. this year they have again produced foliage except the pear which is only half foliage but non of the trees have produced fruit why? is it because they are in too small... show more reasons for non fruit? i planted 4 fruit trees in june last year apple/plum/pear/cherry all in pots,they produced foliage last year but no fruit. this year they have again produced foliage except the pear which is only half foliage but non of the trees have produced fruit why? is it because they are in too small a pot ( 15 inch ) or any other reason?
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