might not be hardy where I live in upstate New York but, I think it is attractive. It's supposed to have good fall color, too.
Thanks to the bloom guide on the High Line website, I was able to identify the flowers in this post.
Finally, deviating from the white theme - a flower I have not seen in years (I don't think) - wild petunia.
Only strange people like me, I guess, visit Manhattan to see wildflowers. But, in the annals of strange, I'm sure this doesn't even rate.
Do you visit places known mainly for one thing, to see something totally different?