Answer: Hardiness zones vary by species so I wonder if your tree was affected by cold weather? An over-abundance of rain could produce the same results. As long as your tree looks healthy and is otherwise growing well, the lack of fruit might be a pollination problem. The tropical guava is somewhat self-fertile but will bear a heavier crop with another variety of the same species to pollinate them. Hope this information provides some insight into what might be happening to your guava tree.
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