You say potato, I say tomato, but what is pomato? Yes, what is a pomato? The pomato is a grafted plant; a combination of tomato and potato plants where you have tomatoes growing on the vine of the plant and potatoes grow in the soil underground from the same plant.   Scientifically, tomatoes and potatoes are both in the Solanaceae family (a family of flowering plants) which makes it possible to graft the two plants so that they grow together.   According to ...