I planted two after moving into our current house, about 17 years ago. It took about 8 years before flowering. I was beginning to think they would never make it but they did and now produce multiple blooms each year. Did nothing special (maybe that's why it took so long for them to produce). They have proven to be very hardy, having survived two snow events and the winter apocalypse of February 2021.
People think I'm an idiot or something, because all I do is cut lawns for a living.