Hard mast, the term used to refer to the nuts wild trees produce, is humbling this way. We know that, generally speaking, trees require a lot of energy to produce nuts, and so a tree won’t produce them every year. The books say every two or three years for beech nuts and three to seven years for oaks, but take it all with a grain of salt.
There are advantages, from a tree’s perspective, to being unpredictable. Abundant years followed by lean years keep seed predators in check. (Biologists call this predator satiation.) In a good year, the woods are flooded with nuts – more than any squirrel or mouse can eat. The next fall, when rodent populations are high thanks to all the easy living, the trees take the year off and the surplus rodents starve.
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