Hebes, nandina , pittosporum, euonymus alatus, daphne, Sarcoccoca , Japanese acer (would need planting in an acid soil for fab autumn colour), osmanthus would all work well in pots. I’ve based this on uk conditions. Summer perennials, perhaps anemone, astilbe, perennial geraniums, lavender, sedums, saxifraga, coreopsis, lupins all flower early to late summer.