Hi - I really can't tell what is wrong just from the picture. If the plant is wilting, it might be a root rot disease. We did get a lot of rain last year and through the winter. If it is a root rot disease, there is not much you can do accept dig the plant out and replace it with a different species. If you want to confirm that this is the problem, you can send a sample to the UConn Plant Diagnostic Lab (https://plant.lab.uconn.edu/) where they can culture your plant for diseases. Contact them first to see how you would submit a sample.