Bee sugar plum. The yield of rock sugar plums is not high. Although it can self-flower and bear fruit, in order to increase the yield, it can also be equipped with pollination trees. It can be matched with plum trees of the same flowering period, such as bee sugar plums. Rock sugar plum is a new variety of plums that have been separated from the bones and cores. It has a sweetness like rock sugar, so it is named rock sugar plum. The sugar content can reach 17.