Artificially occuring forms of vegetative reproduction involve:

(i) Cutting: 

In this, a portion of a plant is cut and planted in the soil, usually a stem or a leaf. These cuttings are sometimes treated with hormones in order to induce root growth. The plant originates from the adventitious roots that grow from the cutting process. 

(ii) Grafting: 

In this, the cutting from some other plant is added to the plant stem embedded in the soil. The graft tissues become incorporated with the rooted plant tissues and grow over time as a single plant. 

(iii) Tissue culture: 

For this, to grow a new plant, the plant cells from various parts of a plant are cultivated in a laboratory. This technique is useful in growing the number of rare and endangered species of plants which cannot grow under natural conditions. 

(iv) Layering: 

In this, the stem of the plant is bent to the ground and covered with soil. Adventitious roots emerge from the plant parts covered with the soil. This attached stem with developing roots is known as a layer.