Hi! This shrub is about 18 ft. high with large pink and purple flowers on the same plant. It looks like a tree peony but I've never seen any this large and the scalloped leaves are different than the pointy peony leaves I'm familiar with. It's growing in part shade in zone 5b.
southseasohio and trackinsand, thanks for the identification! This is quite a specimen with pink and purple flowers. I never noticed this plant before but today it suddenly caught my eye now that it's in bloom. I like the double flowers more than the normal Rose of Sharon.
Resin, I guess there are different flowers with the same name Rose of Sharon.
trackinsand, the shrub I posted pictures of does look like one of the photos on the page you linked to, but it says maximum size 10 ft. and this shrub seemed more than three times taller than me (I'm 5' 4"), so I guess it's a taller cultivar or just found an ideal location and thrives in this climate and with the good care it is given.