After blooming, the flower clusters on my raspberry plants wither and die. The canes remain healthy looking but non productive.
What is the problem and how can I fix this?? We moved in two summers ago. The raspberry “patch” is a 4’ x 4’ plot thick with heathy looking canes. The perimeter is composed of old wooden planks. When blooming there is no lack of bee and insect activity for pollination.
It would seem that the bed may be over crowded, and competing for nutrients. You may try removing some of the plants from the ground to free up some space. This will help rejuvenate the area. I would also feed the bed at least once per year.
This article will help you on the care of raspberries: https://www.gardeningknowhow.com/edible/fruits/raspberry/care-of-raspberry-plants.htm