What about this one? This is not actually native to Pa. but is native to NA. There are other species of evening primroses that grow as tall as 6 feet. This is one that I had in my former “Wildflower Meadow” garden that got overwhelmed by other stuff, and possibly too wet/clay soil since the area has been turned into the Spiral Garden after the successive failure of the more dry prairie-type wildflowers. (Or maybe it couldn’t handle the really cold winter we had one year). I like that these would bloom in the evening with sweet fragrance in your front bed.
OENOTHERA BERLANDER SISKIYOU 'PINK'
(Pink Evening Primrose)
https://www.wildflower.org/plants/resul ... lant=oesp2
Oenothera speciosa (Pink evening primrose)
Pink evening primrose, Showy evening primrose, Mexican evening primrose, Showy primrose, Pink ladies, Buttercups, Pink buttercups
Onagraceae (Evening Primrose Family)
USDA Native Status: L48 (N)
Originally native only to central grasslands from Missouri and Nebraska south through Kansas, Oklahoma, and Texas to northeastern Mexico
...you could also consider dwarf nicotiana, but they would *attract* night feeding moths including hornworm and cutworm moths...
OH! And don’t forget, Bowman’s Hill’s native plant sale is coming up

Fall Native Plant Sale – Bowman's Hill Wildflower Preserve
https://bhwp.org/item/fall-native-plant-sale-2018/
Saturday, September 8, 2018
11 am – 1 pm: Members-only Nursery shopping
1 pm – 5 pm: Nursery opens to the public
Sunday, September 9, 2018
9 am – 5 pm: Nursery open to all