In kitchen-gardens it is planted like the potato, the tuber being cut in pieces.
It is found in the tuber of the dahlia, in the dandelion, and some other plants.
All of these may be grown from seed or by division of the tuber before planting.
Sometimes it attacks the potato, eating down the stalk into the tuber.
This skin is produced by the action of the surface cells of the tuber.
Chemically and physically these cells are just the same as the cells in the interior of the tuber.
Now let us take our tuber, slice it in half, and replace it in the earth again.
A second crop of flowers need not be expected from a tuber that has borne one crop.
But I will tell you more about this class in connection with the bulb and tuber families.
At no time should more than half the tuber be under the soil.