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A heated greenhouse, that is, one in which a winter night temperature of round about 50 degrees F. can be maintained, is out of place on the war-time allotment, but a frost-proof one can be pressed into service and put to a good use for certain vegetable crops and for raising flowering plants for the decoration of the house.

There are three principal types of greenhouses—the span or gable, the three-quarter span, and the lean-to. The lean-to (higher at the back than at the front) is excellent when the north boundary consists of a wall, say, 8 ft. or 9 ft. high. The three-quarter span (Fig. 3) is recommended when the north wall is 6 ft. to 7 ft. high. Both of these types cost less than the span house, since one side can be dispensed with altogether, but the span greenhouse is the most practical. A useful size is 10 ft. or 12 ft. in length and 8 ft. to 10 ft. in width.

A greenhouse is allowed for in the layout (Fig. 1). If one is not erected the heap of leaf-mould with trellis-backed bed in front may be moved to the west boundary and the seed-bed and row of fruit trees or tomatoes extended to cover the extra space. In this case part of the seed-bed may be used for raising a few early vegetables or flowers for cutting.