Bleeding heart plant
Thanks for the question. Bleeding hearts are a favorite plant of mine. They are often infested with aphids but this may not explain the brown leaves on your plants. Look at the leaves and stems and see if any very small (1/8 of an inch) insects are present. The following will give you further information about insect pests on bleeding hearts:
The browning may also be due to a fungal infection called Fusarium Wilt. The following will give you some more information.
Lastly, bleeding hearts do not like wet soil that never dries out. While this may be a possibility, I assume that you have been growing these bleeding hearts in
the same place for several year. Consequently I would not expect something would change this year.
At this time for a short time remedy, I would suggest that cut off the branches with these yellow leaves. If additional leaves begin to turn yellow, then I believe that some infectious
agent is involved. In such an instance then I would suspect the fungal disease that I mentioned above.