Trees and shrubs in South Dakota have been slow to leaf out due to the winter. A lot of woody plants are showing signs of die-back or total death. Most likely due to the winter going through warm and cold periods.
My honeylocust tree is over 10 years old and is only showing 30% growth. Guess it is time to take a chainsaw to it.
If your plant in showing die-back and you do not want to replace it, you can try saving it. Start a good water and fertilizer regime to keep it in good health this summer. Prune out all the dead limbs and twigs to the nearest branch and trunk to prevent a disease or insects from entering the plant.