Just because you live in an apartment does not mean that you cannot have a garden. Well chosen (and cared for) potted plants provide emotional and environmental benefits for urban dwellers. They can beautify outlooks, provide privacy, shade, oxygen, and sometimes even provide food.
The conditions on many balconies are harsh, so make sure that you choose hardy plants, use generous pot sizes and ensure adequate watering throughout the year. Check that your balcony is designed to hold the weight of the pots, soil and plants and also that is has good drainage. If your plants look sad or die then get rid of them. Dead or dying pot plants are not a positive feature.