Plants in containers can live with even less. Viruses are rarely seen and I've yet to see leaf-nematodes cause trouble. Mildew is a definite concern for the older forms of Pulmonaria and one should try to keep these plants in an open, airy position with no nighttime or overhead watering. Propagation of Pulmonaria is quite easy. Divisions can be made in late spring and root cuttings can be made over the winter months.
Seed is variable in outcome, but is very large and easy to germinate.
The most difficult part is in the collection of fresh seed. Looking into the calyx after the flower has dropped off, you will see the single seed developing. Over the next few weeks the seed will change from white to black and will detach with the slightest breeze and disappear unless you construct a collection facility of some sort. Most gardeners let nature take its course and find many delightful seedlings about the garden. Bumble bees and honeybees are rabid pollinators which I have watched flitting from one specie to the other.