Hmm, so I guess it was down to Baccharis neglecta, salicifolia, salicina, or halimifolia. But, the leaves of Baccharis salicina look too wide. Baccharis pilularis (top), salicina (middle), salicifolia (bottom) So, this led most likely to Baccharis salicifolia. Just refreshing this debate because I found another similar specimen today with very narrow leaves (almost like Rosemary):

I have started coneflowers from seed and had them bloom in August and September, but you have to time the planting. There is a new variety called 'Prairie Splendor' which blooms in June. I bet if you planted seed now, you could get them to bloom this year. The blooming time of these plants depends on when you sow them. Get some seeds of them and try it. You'll never know unless you try, but I know coneflowers which are planted late often do bloom after your other ones are finished. I've had them blooming right up until frost. One year I sowed an early crop and a late crop. They will bloom at the normal time next year, however. Here is a link that might be useful: Prairie Splendor

Wow, I've been busy googling---who knew there were so many to choose from! You all gave me so many more choices than I found on my own when I did searches for "tall white perennials" :) Campanula, I love the foxglove idea.... When does it bloom and for how long? Also, the Penstemon is very pretty---I have never seen it before! I definitely need something bold there--- So far I think phlox, digitalis, and penstemon are my best bets. Even the obedient plant wasn't showy enough to be seen from the street---I need a big 'ol white flower. The lilies would work too... but I'm not a huge fan. As far as a picture, I never took one when the obedient plant was blooming! It was pretty, but didn't quite give the 'pop' that the allium did.... which is what prompted a new search :) Thanks so much for all of your help---lots to think about

Most all "wild flowers" are "weeds". Many people buy "wild flower" mixes that contain plants not native to the area, and many "wild flower" mixes will contain many unwanted plants. That does look just like the Pokeweed that grows in my gardens, now. kimmq is kimmsr