This little photograph reminds me that simplest is often best.
They are totally hardy, grow in sun or shade, seed themselves around but are not difficult to remove from places where you do not want them. I remove most of the red ones which are easily identifiable by their red stems. They withstand a certain amount of being tread upon round our table and chairs, and flower from May till November. What more could one ask? They require no attention whatsoever - perfect plants.
I can't help but compare with the showy and demanding delphiniums....(see yesterday's post)
There's a lesson here:
Keep it simple.