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I have harvested limited numbers of berries off 2 to 3 year old plants (~1 - 2 pounds). Usually after 4 or 5 years they can be producing a fair quantity. Depends on the variety and location/environment they are in though as some will probably produce at different rates.

Thank you for taking the time to reply. I was guessing about five years. It's nice to know that 2 to 3- year-old plants can produce.