A large oak tree can drop tens of thousands of acorns in a year, but only a tiny fraction grow into new trees.

Oak trees employ a reproductive strategy called masting, where they produce a massive number of acorns synchronously every two to five years. This phenomenon overwhelms seed predators like squirrels, birds, and insects, making it impossible for them to consume all the seeds. In mast years, an oak can produce tens of thousands of acorns, while in off years, seed production is minimal, causing predator populations to decline due to lack of food. The synchronized seed production reduces the chance that all seeds are eaten, increasing the odds that some acorns survive to germinate. However, the survival rate of acorns is extremely low—studies show about 99% are eaten, destroyed by insects such as acorn weevils, or fail due to drying or fungal infections. This means only a tiny fraction of the seeds develop into mature trees. Over an oak tree’s lifespan, often several hundred years, it produces millions of seeds to ensure species survival. This strategy balances the energy costs of seed production with the ecological benefits of seed dispersal and successful regeneration.