406 VEGETABLE FORCING 
cauliflower, it has no equal. See Chapter XVI for cul- 
tural notes. 
Rhubarb may be forced with success in frames heated 
by manure or steam. If the roots are not planted until 
early spring, no artificial system of heating will be re- 
quired. On account of the length of the leaf stalks, it is 
necessary to use frames deeper than those which will do 
for lettuce and other plants that do not attain a height of 
more than 10 inches. For cultural details, see Chapter 
XIII. 
Spinach is easily grown in frames without any artificial 
heat. A fall crop may be harvested, and early spring 
cuttings may be made of plants started in the fall, or 
perhaps from January or February sowings, depending 
upon the severity of the climate. With proper attention 
spinach will yield about as large returns as lettuce, and it 
may be the means of avoiding a market glut of lettuce. 
(See page 372.) 
Swiss chard may be sown in January in frames, or 
started in hotbeds or greenhouses and transplanted into 
the frames. In the milder sections of the country, pick- 
ings may be made from frames throughout the winter. 
Turnip.—The early varieties of turnips are sometimes 
grown in coldframes, though this crop does not offer 
special financial inducements as a forcing proposition. 
(See page 373.) 
Witloof chicory or French endive claims attention as a 
frame forcing crop. For further paticulars see page 373. 
