The Karl Fisher Machine is an electric machine used for plant grafting. It makes clean cuts and is quick to use, giving it an advantage over other grafting methods; however it is more expensive than just doing the grafting manually with a sharp knife. The machine cuts two slots into the scion and leaves 2 projecting pieces on the rootstock, allowing them to nest together. This makes grafting the pieces very easy if the stems are about the same size because they nest together. After doing this you have only to wrap them in rubber and leave them for 5-7 weeks to see if the graft will take. Some plants, like grape, need to graft area to be covered in wax before planting to prevent drying out.