Looks like Phlox paniculata 'John Fanick'. Our well established plant does fine with sun, heat, and lightly improved (compost) clay soil in unirrigated space - though did required some supplemental water for the first time last week. Would plant now as long as you can get water to it every few days while it digs in.

ps. Sounds like you have a very nice sister :-)

Thanks bostedo, I really appreciate the info and identification. I'll probably plant it tomorrow or Saturday since I have the compost with gypsum. I recently planted the mistflower I got last week and I'm making sure I keep the soil moist, and the phlox will be in the same flower bed so I'll keep them watered as well. We saw them at a nursery earlier in the week and I commented on how pretty they were so she went ahead and bought them. :-)

Here's one that's planted in amended soil and I added a lot of mulch around both plants. It's a little crooked right now but eventually it will straighten up. ;-)

Nice - will be 3 to 4 ft tall in a couple years if happy. I try to remember to shorten them in mid-to-late spring because they can get bloom heavy. Neglected it this year and they're now just over 4 ft... another plant that simply ignores the tagged height of 2 to 3 ft. Was sure the wind and rain that came through DFW last night had flattened them, but were spared probably because the blooms are not at their peak weight yet.

Wow I can't believe your plants are over 4 ft. I'm hoping my plants do well and I'm making sure they're watered and hopefully the mulch will keep them cooler? I was surprised they didn't wilt when I first planted thgthgem, hopefully that's a good sign?

Wow those are beautiful! The wind has been knocking the blooms off of mine but they haven't wilted yet. I hope my plants eventually look like yours one day?

They will, and if they multiply as mine do, you will plants to share.

That will be even better because I usually share extra plants with a couple of local gardeners.