Hi Umbrian
How right you are. I remember my first time in Rome. We had a balcony with some plant troughs on and they were as dry as a bone. A couple of days after a violent thunderstorm "weeds" began to sprout in the troughs and one in particular caught our attention as it grew at a rate of about 6 inches a day. At least it seemed that way to us. And so we watered it and it grew and grew sending out a couple of side shoots which began to entwine around the railings of the balcony. After a couple of weeks we started to get beautiful, pale pink delicate cup-shaped flowers. Yes, a bindweed but it stayed with us all the way through to winter and gave us new flowers every day.