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What Type of Tree Makes an Acorn? Only trees in the Quercus genus produce acorns. Watch a squirrel or chipmunk forage for food and no doubt a cache of acorns will appear. Acorns provide food for various wildlife, or they would otherwise litter the forest floor and rot since they are too heavy to disperse via wind.
Oak trees don't start blooming and producing acorns until they are around 20 years of age, according to the University of Tennessee Extension Service. As the tree continues to grow, they start producing even more flowers and acorns until they are about 80 years old. At that time, acorn production begins to diminish. Oak trees produce the most flowers and acorns between the ages of 50 and 80.