Bougainvillea can be stunning on a hot, sunny balcony, as can agaves, cordylines (look for the reddish bronze ones or yellow and green striped ones), ornamental grasses of all kinds, any cacti or succulents; geraniums/pelargoniums, erigeron, white or purple alyssum, daisies, rosemary, lavender, sage, calendula, petunia
