Posted: 21/03/2016 at 10:22
I water the pots on my terrace every day in summer when it's hot here in SW France.
You should be able to plant exotics and Mediterranean plants then, like banana plants, agave, cannas, bamboo. Or certain grasses, lavender, small leafed hebes.
Makes sure the balcony can bear the weight and watering won't leak onto anyone else's property. I you make something like a roof garden you may need planning permission.