Thanks, Bob, Cindy.
Cindy, do you, with you plant, need to take the reversions/reverted leaves out?
Our other current problem with Brunnera is with 'Alexander's Great'.
Planted one last year and it's seeding; as expected, not true to the cultivar.
Was apparently a sport (plant now patented) found in his garden in Belarus by a guy called Alexander.
Pictures below (today).
First a comparison between 'Alexander's Great' and 'Jack Frost' (latter planted a number of years ago).
We have no other seeding from our other Brunnera.
Stopped using Brunnera macrophylla because it's seeding around became a nuisance.
Below suggests a need to pull out at least seedlings close to the mother plant;
that since reversions in the direction of the wild type are normally more robust than the cultivar itself.
Am beginning to even think that 'Alexander's Great' itself is too robust for me!
