I have a flower bed that is mainly tall perenniels like gaurnia(?) cone flowers,bellflower,pin cushon flowers. In back of them I have foxglove, dephinium, and plan to get hollyhocks. love the color contrasts...like to keep the colors white, purple and blue. I am looking for something that will look nice in front of these taller plants that fits the color sceme. I am looking for ones that bloom all summer and that require little maintenance. (I have small children so I don't have a lot of time to fuss over the plants.)
I am in zone 5. Gets full sun.
Do you have any ideas?