A grafted Esrog, or a later generation of a grafted Esrog, is Pasul. There are four general signs in a kosher esrog which are different in an esrog grafted with lemon.
- A grafted esrog is smooth like a lemon while a kosher one is bumpy.
- A grafted esrog has its stem grown outside the esrogs body while a kosher one has it indented into the esrog.
- A grafted esrog has less peel and more juice while a kosher one has more peel and less juice.
- A grafted esrog has its seeds sitting horizontally while a kosher one has its seeds vertically.
Buying an Esrog that has tradition: Despite the above one should be careful to only buy an esrog that has a tradition that it is not grafted. An example of such an esrog is the Yanovar which grows in southern Italy.