I really enjoyed the photos of Pont-Aven. My wife and I spend a month each year in Brittany (Quimper) near Pont-Aven and love the area. "Ti" is "house" or "house of" in Breton. For example, "Ti Ker" is the town hall (Ker=town). The flower is valerian. It is very common there and grows wild as well as in planted gardens. Nevertheless, few people know its name. We have asked numerous times and were unable to discover what it was called until we toured an English lady's garden (in France) who knew it. We confirmed by looking it up online. It comes in white and numerous shades of red and pink.