I live in the countryside and in the process of completing the garden..I have a small area that goes around the path that i need to plant. The its about 3 ft wide x 10 ft long. It sits under the raised bed and next to the path. I currently have a dwarf conifer and a bamboo planted and a ground covering plant..I still have a lot of room but don't know what else to plant? I want colour..cottage and ones that come back every year..not bedding plants..I will fill the ground with blue slate..the soil gets very soggy in winter as hardly drains due to sandstone about 2 ft down..