Suitable perennials for containers in full sun?
What a nice opportunity for you! However, before you choose the plants, you might want to give some thought to color, height, period of bloom. There is abundant information both online and in library books. Here are some suggestions that I have used in containers on a sunny terrace:
roses (dwarf varieties)
agastache (hyssop - many lovely varieties)
lilies (particularly daylilies)
Be sure to check that the particular varieties you choose are perennial in our zones 5 - 7. You might also want to combine perennial plants in contaners with annuals for spectacular displays. The rule of thumb for creating effective combinations is thrillers (tall), spillers (trailing), and fillers (for filling in). Have fun.