Recently, when I've come home from work in the early evening, the gaura blossoms have been all shriveled up. I thought maybe they were being eaten by bugs, but I think it's just the heat that has dried them out. However, today it rained intermittently for a few hours and it was 66 degrees when left yoga and not 90 degrees Fahrenheit.
For the rest of the photos the flash kicked on, so they're silhouetted by artificial light. I was so excited to see gaura that wasn't dessicated by the heat or wind that I'm sharing the photos anyway.
Hard to believe, but it's in the same family as evening primroses. I think the cultivar I bought is called "whirling butterflies."