Answer: Plum trees usually take about four to six years or so to become established and begin fruiting. These trees need full sun and adequate nutrients to flower well, and you need good flowering in order to have fruit set. Sometimes spring frosts will damage flower buds and reduce fruiting, or weather conditions or lack of bees will reduce fruiting due to pollination problems. I should mention that most American-type plums do need another variety of plum tree for pollination. Without knowing which kind of plum you have, it is difficult to suggest a companion tree. I hope this helps you trouble shoot.
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