Your balcony’s size will determine the best vegetation for your garden, but fruits and veggies, like tomatoes, strawberries , herbs and lettuces because they don’t require very much space.
Always plant plants which attracts beneficial insects and pollinating insects.
Plants that require the structural support of trellises or cages to grow properly (cucumbers, beans and other climbing plants) can make use of railings and beams on a balcony.
Basically don`t grow plants that are not suited to your growing conditions!
The Concordia Greenhouse 