Fruit left hanging on a citrus tree inhibit the budbreak of both vegetative and floral buds at two key stages. First, young developing fruit inhibit budbreak in the summer and early fall, reducing the number of new summer and fall shoots (branches) that develop, and thus reducing the number of nodes on which would have produce floral branches the following spring. Second, mature fruit inhibit the spring's budbreak, and the subsequent development of the predominantly floral shoots (branches), as well as the relatively small number of vegetative branches that characterize the spring bloom, thereby further reducing the floral intensity of the bloom the following year. Winter fruit removal results in a shift toward more floral and fewer vegetative branches. Your trees not blooming had nothing to do with the Fling Dragon rootstock, but rather with fruit left hanging on the tree for an extended time.. BTW I've been to Fredericksburg Texas, a town of many stone buildings. I liked Fredericksburg, its anice city with friendly people. I visited the Admiral Chester Nimitz museum while I was there. - Millet