This is one garden bed that should work for you. Nevertheless, include some of your favorite perennials. If those are delphiniums, stuff them in and stake them well. Summer bouquets featuring the tall blue spikes will be special. Frilly pastel blooms are valued for their exceptionally long vase life.
Plants are very prolific and bloom from mid summer till frost.
Stake China asters carefully to promote strong straight stems. Single colors are back in vogue. Mix just the colors you want for cutting. Try the tall elegant 'Rocket' snaps for luxurious spikes of rich color. Provide firm support early, or the heavy flower stalks will sag.