My mum came and visited last year and loved all of the purple flowers on the boulevards -- ie down the center of 9 de Julio and pretty much in any of the public parks, the tall stalks with purple flowers. She wants to see if she can find them back home to put on her terrace -- does anyone have any idea what they are called? I haven't a clue. I don't know if they are native to here or if you can easily find them in North America, but they seem to grow like weeds so would be easy to have!