I have several of these now, in various leaf colour varieties and think they are wonderful. However, you should not call them forgetmenots, the flower does look similar but it is a totally different group of plants. The don't have the potential to be come a nuisance in the way that myosotis can do. Brunneras appear to be quite hardy, I had two the year of the very long hard winter, 2010-11, and they both survived, rather to my surprise. They looks good for most of the year too, always a bonus, especially with a flowering plant.