I love Magic of Oz. I have had it for 9 years and look forward to it blooming every year. Stats are pretty true in my garden and it does bloom for a long time. In 2014 it decided not to bloom, not sure why as it gets plenty of water and fertilizer. Its only downside for me is that it is very slow to increase. In those 9 years that I have had it, I have never had to divide it. I will keep it because I am partial to green throats.
