MISCELLANEOUS VEGETABLES 361 
Fig. 127.—Chinese cabbage. 
which, with rather copious watering after that period, 
would prevent the breaking down of the tips of the 
leaves. 
According to experiments made by Hepler at the 
University of Wisconsin, 12 to 16 weeks are required to 
grow Chinese cabbage to marketable size. It is possible 
that special strains of this interesting salad plant could 
be developed which would thrive well under glass. The 
trouble is that Pe Tsai was never accustomed to green- 
houses in old China. 
CRESS 
Water cress (Nasturtium officinale) is one of the easiest 
crops to grow in the greenhouse. A small planting of it 
is always desirable in private establishments, and com- 
mercial places, which are located near markets that are 
