There’s an instinct to go for small pots (and more of them) on a tiny balcony, but in fact, this tends to look fussy and messy. You’re far better off going for the largest pots you can afford and that will fit on the balcony, which will actually make the space look larger. It also makes for healthier plants, which will thrive in deeper, moister soil. In short, one or two large pots with big, healthy plants in them will look miles better than 20 tiny pots with struggling plants to create a balcony garden.
Before you start shopping, look for lightweight pots – fiberglass rather than solid terracotta – as these will be easier to get into the apartment, for a start, and will get around any weight restrictions on the balcony.