I think our very dry conditions is limiting the growth on my Brunnera. I just try to water it much more frequently. Took me awhile to get used to doing that since majority of my other plants are succulents that do not require frequent watering. Had to give this one something extra water wise.
I remember it was a bit taller and bigger when I got it in 2013, then after repot it just settled on to that height and growth later on. And I am not keen in giving fertilizers, so my Brunnera continues on smaller. As long as it endures our summers and blooms in Spring, it will stay.
