There are many known uses of Hori Hori knives, and you can use them as a quick soil aerating tool to get the oxygen to plant roots. It is also helpful in sufficiently watering the root surrounding soil. The special blade of Hori Hori is ideal for getting the weed at its roots and flicking it off in one go. A serrated Hori Hori blade is suitable for cutting through the stubborn roots and root balls. These knives also work well as pruning devices for smaller branches. You can also use a Hori Hori blade as a marker stake. With a hole in the handle and some string or wire, you can make the garden marking easier and accurate. At times it is also used as a propagation tool to cut through larger root balls.