The stranger plant can boost a player's Farming level by +1 plus 4% of the players normal farming level. The boost is not automatic but must be activated by interacting with the familiar and requesting the boost. The boost is very useful for planting seeds that require a slightly higher farming level than the player has. For example, a Spirit seed requires level 83 farming to plant but can be planted at level 79 farming when using the familiar's boost. The boost does not stack with other farming boosts like that from a Spicy stew.