Answer: It would help to know what variety of plum you're growing. Most plum trees need a second plum variety for cross pollination. It could be that your tree was cross pollinated at the nursery and that's why you got fruit the first year. Subsequent flowering without a second plum in the vicinity would result in no fruit. Sometimes weather dictates whether or not plum trees will bloom so that may be what happened this year. I'm afraid you'll need to wait another year to see if your tree flowers. If not, it is either the wrong variety for your growing region, or the weather is not conducive to flowering each and every year. Wish I had more to offer!
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