Which is not a method of vegetative propagation ?

Sowing

The correct answer is Option (4) - Sowing

Vegetative propagation of plants is essentially the reproduction of plant material from vegetative organs so that the offspring will contain the exact characteristics of the parent plant with regards to genotypes and health status . This is possible because plants unlike animals have meristimatic, undifferentiated cells that can differentiate to the various organs necessary to form a whole new plant. Thus a piece of plant shoot, root, or leaf can grow to form a new plant that contains the exact genetic information of its source plant .

Sowing is related to a method of agricultural practices. Sowing is the method of planting seeds which are produced as a result of sexual reproduction. These seeds then develop into the plant in favorable conditions. Whereas, budding, layering and tissue culture is the method of vegetative propagation.