Nasturtiums are great container garden flowers. They come in many colors and are easy to grow and very hardy. They thrive in poor soil and you can eat the flowers and leaves. The round leaves are beautiful and are very spicy - a great addition to a summer salad.This container garden picture was taken in Ireland, where nasturtiums grow almost like weeds. Made of rough stones, this container garden, looked fabulous with nasturtiums spilling out from between them.