I have a flower bed on my back fence approx. 100 ft long that contains canna lilys, iron plants, banana plant, small palm and another couple of plants from the lily family I do not now the name. I also have 5 other palms in my landscape near this bed. I would like to extend my garden that is now grass with some colorful(preferably blue or dark purple), low maintenance perennial flower. Any suggestions?
It will help for you to determine your growing zone in your selection of plants.
Determine your sunlight and soil conditions.
Visit local garden centers or greenhouses to see what is available locally.