Vegetative propagation is a form of asexual reproduction of a plant. Here, only one plant is involved and the offspring is the result of one parent. The new plant is genetically identical to the parent.
Micropropagation is the practice of rapidly multiplying stock plant material to produce a large number of progeny plants, using modern tissue culture methods.
Layering is a means of plant propagation, in which a portion of an aerial stem grows roots while still attached to the parent plant and then detaches as an independent plant.
Sowing is to scatter the seeds over the land for growth
So, the correct answer is 'Sowing'