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.
For a wedding gift to me, my husband bought me the Spring Bride Duet - a combination of Cosmopolitan Darwin Hybrid tulips and Stainless Daffodils. We planted them in the fall of 2015, and they have faithfully come up each year. I thought the daffodils and tulips were a good combination for us in case the deer ate the tulips, the daffodils would still be standing. Also, tulips can fade over time but daffodils multiply. So far, both have come up faithfully, and beautifully, each year, and the deer have left them alone. I would buy Darwin Hybrids again - they have really strong stems and huge flowers! The Cospmopolitans color changes over the time they are up. They come up a pale peach/pink, and then slowly shift to a brighter pinkish/red.