My father always planted these when I was growing up, and he recently mentioned that they used to grow outside the buildings he grew up in in the city. It was a traditional city neighborhood, and his cousins and aunts all lived in the same block. So happy to have these cheery summer blooms here at my home now too. I showed them to my nieces last month in the early afternoon, and all on their own they shouted, "let's go check them" at four o'clock. Apparently it is not the time that drives their late-day opening, it is the drop in temperature. I took the first picture tonight in the rain - about 7:00 pm. The others were taken in the early morning 3 days ago.