The production of more plants.

vegitative propagation is when plants reproduce asexually duuuhhh

The act of propagating; continuance or multiplication of the kind by generation or successive production; as, the propagation of animals or plants., The spreading abroad, or extension, of anything; diffusion; dissemination; as, the propagation of sound; the propagation of the gospel.

You call the reproduction of seed plants mostly happens through a process known as apomixes. This is similar to sexual production in the animals.

some plants can be artificially propagated by using their vegetative parts and this is called artificial vegetative propagation