Name two common grafting methods used in horticulture?

• A. Topworking graft and side-veneer
• B. Bud graft and root graft
• C. Whip-and-tongue graft and cleft graft
• D. Grafting by air layering

Answer: (C)

Two common grafting methods used in horticulture are whip-and-tongue graft and cleft graft. At the heart of grafting is getting the cambial layers of the scion and rootstock to line up so they can grow together and form a strong union. The whip-and-tongue graft involves making matching diagonal cuts on both pieces and adding a tongue-like projection that interlocks. This increases the contact surface and helps hold the pieces in place, making it reliable for small to medium-diameter stems and promoting a quick, robust connection when cambial alignment is achieved.

The cleft graft, on the other hand, splits the rootstock and fits a wedge-shaped scion into that opening. The cambial surfaces meet around the edge of the cut, and the graft is secured to allow tissues to fuse. This method is straightforward and versatile for larger-stock situations or when the scion is a bit thicker, and it remains a staple technique in fruit tree propagation and nursery practice.

Other listed methods are valid grafting or propagation approaches in different contexts—topworking is about changing the cultivar on an established tree, side-veneer is another grafting option used in various scenarios, and air layering is a propagation method that doesn’t involve joining two pieces of plant tissue via cambial fusion. The two described techniques are among the most widely taught and commonly used due to their effectiveness across a range of sizes and species.