Among the following which is not an artificial method of vegetative propagation?

Budding is not an artificial method of vegetative propagation.

Budding is a method of asexual reproduction that occurs naturally in some organisms like yeast, hydra, etc. Generally, a bud develops as an outgrowth on the parent body due to repeated cell division at one specific site. The new organism detaches later from the parent body and grows as an individual.

Cutting, layering, and grafting are artificial methods of vegetative propagation in plants.