Answer: You should be aware that perennials take a few years to get established, so plants set out this year will probably take a year or two to really take off and produce lots of flowers for cutting. I suggest planting some annuals as well so you'll have plenty of flowers this first year.
As far as what to plant, there's a whole range so it's hard to pick just a few. You might enjoy reading a book on cut flower growing -- there are a number of them available.
Here are a few options:
Perennials: achillea, coreopsis, coneflowers, delphinium, heliopsis, irises
Annuals: zinnias, cosmos, scabiosa, baby's breath, cornflowers
You might also enjoy planting some ornamental grasses, which are nice in both fresh and dried displays.
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