I planted three Bleeding Hearts last year. They were healthy and very pretty. This year there are seven or eight others all around the yard, as far away as fifty feet! They're even popping up under azaleas!
As expected, they ended last season with pods that shriveled up, however, I didn't see them break open. I understand that wildflowers can spread by methods such as seeds being blown by the wind or carried by birds, but we've had bleeding hearts in other places we've lived, and have never seen this behavior.
They're adding beauty to my landscape, free of charge, so I'm not complaining. I'm just wondering about the mechanism.