Soil knives, or hori-hori weeding knives as they are also called, have been utilized by homeowners in Japan for generations. Picking up this point for your garden is ideal.
A soil knife has a conclave blade for digging. The edge is sharp enough to slice through rough spaces. You can even find a serrated edge on some spots to help you cut thick items.
A soil knife works well for cutting through thick spaces and getting through hardy surfaces. A knife is ideal for keeping your cuts going well. The knife should feature a head that you can clean off and polish as necessary, especially if you want it to cut through the soil without hurting anything else in your space.