Experts and BHG readers answer.
Hosta for sun
Thanks for writing. I don't know of any white-flowering hostas that will thrive in full sun --- most sun-tolerant hostas only seem to do well in part sun otherwise their leaves start to get sunburn and look bad, especially in your region where summers can get so hot.
If white flowers are important to you, maybe there are sun-loving, white-flowering perennials that would be a good substitute?
---Justin, Senior Garden Editor, BHG.com