I have about 5 Kieffer pear trees that stand a good 15+ feet tall, 2 inches in diameter at the trunk. These have been in the ground for 5 years I believe. They look great, fully leaved out, good structure, were full of blooms. We had a late spring, but no late frost. Once again, no pears. Question, what is the holdup? Do Kieffers need a pollinator of different variety? If so, what type?