Whip or tongue grafting is generally used for

• A. On large tree limbs
• B. For plant material that is 1/4 to 1/2 inch in diameter
• C. The change the cultivar of a young tree
• D. On herbaceous plants

Answer: (B)

Whip grafting is a method designed for joining two pieces of wood where the cambial layers can be neatly aligned on small-diameter material. It works best when the scion and rootstock are about a quarter to half an inch in diameter because the cuts create matching cambial surfaces and the tongue flaps interlock, helping the graft hold together and heal properly.

This size range is exactly what makes whip grafting practical: the cuts are shallow enough to expose the cambium without breaking through the wood, and the tongue on each piece helps align and stabilize the graft as moisture and tissues fuse. Larger limbs aren’t suitable because achieving reliable cambial contact and a secure fit becomes difficult, so other grafting methods are used for bigger wood. Grafting is also typically done on woody plants, not herbaceous ones, and changing a cultivar on a young tree often uses different techniques or approaches rather than whip grafts alone.