My rosemary bush is emitting very little fragrance, and the leaves are dry to the touch and show signs of yellowing.
Rosemary Bush Emits Very Little Oil or Fragrance
Certified GKH Gardening Expert
It sounds like the plant may be overwatered and may be dying because of it. Cut back the amount of water given the plant. This article should help you with rosemary care: https://www.gardeningknowhow.com/edible/herbs/rosemary/growing-rosemary-plants-rosemary-plant-care.htm