A billhook saw is one of the best gardening tools thanks to its versatility. They are designed for trimming shoots and stems, cutting vines, severing roots and sawing branches. If you've got an overgrown garden, or one filled with coarse ornamental grasses that need to be cut back, try a 13- or 18-in. billhook saw. This Fiskars model feature a rust-resistant curved blade for quick pull cuts, and a coarse saw edge for removing tough branches and grasses.