Helianthus, Lemon Queen.

Persicaria polymorpha is 6' x 6' and blooms from May right through fall. No pests and forms a very tight clump. A real favorite. I have never used it as a cut flower though. I only take flowers from the garden after a storm, usually Delphiniums that have toppled.

Hardy Hibiscus?

One of the silphiums perhaps?

Hydrangea paniculata Quickfire, Baptisia australis (might only be 4 1/2'), one of the medium height Clematis on a 6'-8' trellis, Veronicastrum virginicum, some of the really tall fall asters (both in genus Aster and genus Symphyotrichum), tall Delphinium.

Rudbeckia Maxima! Can reach 8 feet talk and finches love the seed heads.

I love Jerusalem Artichokes/Sunchokes (Helianthus). (It's not the same helianthus as Lemon Queen mentioned above, which is a perennial sunflower.) They can get over 6' tall easily, though. They do multiply, but they're easy to control in our area if you just put them on the menu. Their tuberous root is a tasty starch you can cook. Showing up in several restaurants around here because of the emphasis on local produce. Apparently they're not best eaten raw, at which point they're called fartichokes. First I'd make sure they're not too happy where you live. They can apparently procreate like rabbits in some areas. I do love them here, though. Happy tall pretty flowers.

If you don't want the tubers, the perennial sunflower Helianthus 'Flore Pleno' is pretty. Very tall with double flowers.

Green headed cone flower ( don't remember the botanical name ) and Autumn Minaret daylily have worked well for me. Also a cutting flower, that's a bit harder. Are tall grasses an option?

Sherry

not necessarily perennials in the traditional sense, but self-seed easily so no need to restart each year with store bought seedlings...

Hollyhock

Amaranthus "love lies bleeding"

castor bean

For bushes, can't go wrong with lilac or forsythia. Lilac cuts well enough, and forsythia buds can be forced in water during the winter :)

Thank for the suggestions! I am researching a few of them and trying to decide if I want a mass planting or mix and match!

I would start some flowering shrub since you want cut flowers. I like fragrance so my favorite would be.....

peony,

Sweet shrub Carolina allspice

smack me. So you do not have to go into total lose of rose withdrawal ....

Sunny Knock Out Rose. I do not think of it as a cut flower candidate but they sure smell good and a long bloomer

Planted behind the bushes

oriental tree lily.........."Boogie Woogie" and "Satisfaction

Plant annuals suggested. I buy seeds every year and plant them around my peony. They grow up into the peony and it looks like my peony is blooming all summer.

Coreopsis tripteris is another large perennial that hasn't been mentioned. Also Patrinia scabiosifolia.

Got both of those on the go this year, Lacey. I have been besotted with tall perennials for years, despite not really having the space...until recently since when I have really gone to town. I hesitate to mention the classic full sun verbena bonariensis...but it is a good doer, for sure. Have a good look at the apiaceae family. Stunning with grasses and asteraceae, meadow rues and sanguisorbas and eryngiums.

Marquest, I like the peony idea! Is there one with a long bloom time? I inherited 3 mature rose bushes with the house and they bloom profusely if treated early. But I'm not a fan of pesticides, so they are covered in sawfly larvae. Mother swears these are knockouts. After yrs of sawflies, I need a break... :(

Lacey, coreopsis is on my list for my other bed! :)

hl_60, I did not think Knockouts had any issues. I have had sunny for three years and I do nothing to it. I do not do roses because they want to much care. I was so excited when I found this rose.

I like the most fragrant peony and most are. I have purchased them less than this site below but this will give you an idea of the most fragrant and bloom times. I have gotten some that are here from Gilbert h wild for 8.00.

http://www.hiddenspringsflowerfarm.com/fragrant-peonies.html

Marquest thank you for the link! I'm excited about the peony prospect. I'm glad your knockout has done well.