Autumn olive (Elaeagnus umbellata), also known as Japanese silverberry, is a deciduous perennial shrub native to temperate and tropical Asia that was introduced into the United States in the early 1800s from Japan. Autumn olive has become a problem outside of its native range due to the fact that it is a prolific seed producer and is capable of rapid growth in a wide variety of environments, including environments poor in nutrients. It often forms dense thickets that shade out native species and increases the nitrogen content of the soil.

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