Shrubby Potentillas - they just keep going. Roses if you pick the right sort. Hydrangeas if you count bud/bloom/faded flowerheads. Anything that has flowers followed by berries, especially if the birds don't like them! Weigelas last quite well here.
But where you live and the weather will affect your results. This year's weather has been brilliant for the tulips, they've been out for weeks and still going strong, less good for the cherry blossom. Hot, dry summers can curtail the flowering of things that prefer a more temperate climate, while untimely frosts can damage early or later flowers.
Hardy fuchsia usually flower all summer and into autumn
If you have a garden and a library, you have everything you need.”—Marcus Tullius Cicero East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham
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East facing, top of a hill clay-loam, cultivated for centuries (7 years by me). Birmingham