Air layering is one of the methods of arificial methods of vegetative propagation. It can be successfully be done over, guava and tamarind plants.
But,
In case, of guava natural method of vegetative propagation is possible. In Guava , natural vegetation can occur through roots. Roots of guava develop adventitious buds which sprout under favorable conditions.
Natural methods of vegetative propagation are not found in tamarind.