Disease in Hydrangea
My leaves have brown edges and blue blooms have purple spots in them. I was told to use a copper fungicide spray. Also, butterfly bush leaves have yellow discoloring in middle of leaves and some have holes.
Usually brown edges on hydrangea means the plant has experienced dry conditions at some point. This cannot be reversed, but new growth should not have the brown edges if the plant is getting enough water. This article should help with the color problems: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/change-hydrangea-color.htm
The butterfly bush should be checked for pests. Neem oil would be a good spray. If the yellow leaves are older leaves, this is normal.