A gardening trowel is used in the members only skill Farming. It is used both to fill a plant pot with earth from a weeded patch, and to plant a tree seed into that plant pot to begin the process of growing a tree.
These can be obtained by killing farmers, bought from Farming shops, or by trading other players.
Players can withdraw unlimited amounts of gardening trowels from the tool store 5.
The tool leprechaun can store one of these tools for you.