I'm a big believer in polycultures, even in containers
Here's a combo of shade tolerant perennial herbs and vegetables I grew in a tub that is 70 cm long, 55 cm wide and 30 cm high:
Good King Henry (Chenopodium Bonus-Henricus), Welsh onion (Allium fistulosum), Sorrel (Rumex spp), Purple plantain (Plantago spp.), Lemon balm (Melissa officinalis), Salad burnet (Sanquisorba minor)
It looks quite pretty too!