Nasturtiums are beautiful, and extremely edible. The leaves have a mildly pepper taste like watercress and make an excellent salad green. The seed pods are also peppery and can be eaten like capers. And the flowers are a colourful addition to salads.
They're annuals so they die each winter. But they're very easy to grow from seeds, and will self-seed so you may find you can develop a perennial patch without the effort of planting them yourself.
They'll climb up any framework such as a wigwam of canes, a lattice screwed to a wall, or through a hedge. They also tumble attractively and I like to drop a few seeds into hanging baskets or window boxes. In Ireland I saw lots of them grown in clumps in people's front gardens.
I love them very much, even though I'm not normally a big fan of flowers. Oh, I like to see them when somebody else has grown them, I just can't be bothered to grow the darn things myself. But nasturtiums are undemanding, unpretentious, pretty, and edible. Now that's my sort of flower.