I have 35 large blueberry bush's. 70% are 8'+. Most are highbush, some are rabbit-eye. They grow in (for around here) decent soil. They are about 30 year's old. They have not been fertilized in 20 year's. I know they could stand to be cut back but since they are not commercial losing that visual impact for a few year's might not be the best idea. But i don't know. Maybe being cut back would be the best thing for them. Last year the berry's were getting fairly sour. I think they need sulfur. I was going to broadcast 0-0-5 on both side's and side dress with sulfur in Feb. But i really don't know. I have never had to care for blueberry's before. What would you do ?