Most of my garden is newly planted this year, but these are among the few that are settling in well:
1. True lilies
2. Crambe maritima
3. Allium 'Summer Beauty'
4. Phuopsis stylosa
5. Allium nutans 'Pam Harper'
6. Veronicastrum 'Fascination'
7. Monarda 'Raspberry Wine'
8. Allium sphaerocephalon
9. Hemerocallis 'Notify Ground Crew'
10. Hemerocallis citrina 'Yao Ming'
My spring planted hardy geraniums, alchemilla, penstemons, perovskia, tall phlox, agastaches and many others are really struggling with the heat and drought in spite of regular hose waterings.
I have a small plant of Helenium 'Mardi Gras' just starting to flower now, but I find that I need to water it almost daily or it goes into a frightening death wilt.