The item ID for Blueberry Plant 3 (POI) is plantedBlueberry3Harvest
This is the GiveSelf spawn command to give yourself Blueberry Plant 3 (POI) in 7 Days to Die.
Copy the command below and paste it into your 7 Days to Die game or server admin console to obtain. You can open the console by pressing usually one of these keys (F1, F2, *).