Peter Henderson's Gardening Calendar
from Gardening for Profit, 1866
DECEMBER—Occasionally, we have the ground open so that digging and plowing can be done to nearly the end of the month, but it is not safe to calculate much after the first week; though by covering up the roots, still undug, with their own leaves or with litter, we are often enabled to dig our Horseradish or Parsnips very late in the month, and like all other vegetables, the later they remain in the soil they grow in, the finer is the quality.
Celery trenches should receive the first covering, early in the month, if the weather has been such that it has been unnecessary before; the covering should not be less than 4 or 5 inches of litter or leaves, only taking care that the material is light, weight or closeness would prevent evaporation too much at this season, while the weather is not yet severe; the final covering should not be later than the end of the month.
The crops of Spinach, Kale, Onions, Shallots, etc. that have been planted or sown in September, should be covered up with hay or straw if their position is much exposed; if not, there is no particular necessity. When all has been secured safely in winter quarters, attention must be energetically turned to procuring manure, muck, and all available kinds of fertilizers; there is little danger of spending too much in this way if you have it to spend—depend upon it, there is no better investment if you are working your Garden for Profit.