What fruits? Think any fruit that now comes in dwarf or semi-dwarf varieties, from cherries to apples, bananas, lemons, oranges, avocados (which will survive well on a sunny barren patio if sheltered through their first summer and winter), pears, or cumquat. Add grapes and kiwi fruit to that, or maybe a choko vine, to twine around the balcony, plus large hanging baskets of parsley, buttercrunch lettuce (plant a pinch more seed every fortnight) zucchini, tomatoes, kale, silverbeet, ‘bush’ pumpkins that grow no larger than zucchini plants, six planter bags of potatoes (one kilo of seed potatoes should give about 10 kilos of spuds) and you have a considerable saving.