From Gardening Wiki
Mint During Winter
Q. How can I obtain a supply of Mint during winter ?
A. Procure some boxes in which holes have been made for drainage, cover these with a large layer of leaves or short straw,
then a layer of soil on top ; next lift some of the roots from the
beds, shake off most of the old soil, then place them in boxes
as close together as possible, covering them with 1 inch or so of
soil. Any old potting soil will do. Give a good watering, after
which place in a warm house. The roots will soon begin to produce an abundance of nice green shoots. In place of boxes, if so
desired, pots may be substituted, and will often be found more
convenient, especially where only a very small quantity is required.
As there is often a demand for Mint before it comes on under
natural conditions, this method of forcing is particularly handy, since
it entails little or no trouble beyond a plentiful supply of moisture.
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