Answer: Santa Rosa plum is considered self fertile, or at least partially self fertile. However, even self fertile plums will develop heavier crops if there is a second plum tree in the yard. Trees need a companion from the same family to provide pollination. Plums are from the Prunus family; Apples are from the Malus family. Plums need plums and apples need apples - however a crabapple tree is from the Malus family and will help pollinate an apple tree. Hope this information clarifies things for you.
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