Potatoes are cultivated by

Potatoes are cultivated by Buds on tubers.
Stem tubers form thickened rhizomes (underground stems) or stolons (horizontal connections between organisms); well-known species with stem tubers include the potato and yam.
Potatoes are mainly propagated by vegetative methods (cloning). Potato tubers have nodes or eyes from which the new growth begins. The new stems growing from each eye are called sprouts which give rise to the new plant. Vegetative seeds can be either a whole tuber or a cut tuber.