What fruits? Assume any fruit that now is available in dwarf or semi-dwarf varieties, from cherries to apples, bananas, lemons, oranges, avocados (which can survive nicely on a sunny barren patio if sheltered by way of their first summer time and winter), pears, or cumquat. Add grapes and kiwi fruit to that, or possibly a choko vine, to twine across the balcony, plus giant hanging baskets of parsley, buttercrunch lettuce (plant a pinch extra seed each fortnight) zucchini, tomatoes, kale, silverbeet, ‘bush’ pumpkins that develop no bigger than zucchini crops, six planter luggage of potatoes (one kilo of seed potatoes ought to give about 10 kilos of spuds) and you’ve got a substantial saving.