CULTURAL DIRECTIONS 
26l 
with lettuce or other vegetables. It should be planted 
in very rich soil to secure heads of desirable size. 
343. The Danish Ball Head Group. — The Danish 
Ball Head is variously known as Emperor, Holland, 
Hollander, German Export, Armager and Dutch Win- 
ter (Figure 67). It is grown almost exclusively for win- 
ter use in Denmark, and was introduced into the United 
States over 30 years ago. The variety has become ex- 
ceedingly popular as a winter cabbage because of its 
superb keeping qualities. It is grown extensively in 
New York and other northern states, where the cabbage 
industry has developed to a marked degree. For bury- 
ing or storage it has no equal and is practically the 
only variety held for mid and late winter sales. There 
is considerable varietal variation in the type, but the 
heads are nearly round, very hard and solid and usually 
range from 3 to 8 pounds in weight, although larger heads 
are common. A 4-pound head is a good weight, and if 
all the plants in a field average 4 pounds the crop is con- 
sidered excellent. This group is not adapted to warm 
climates or to certain types of soil. A satisfactory crop 
is seldom if ever grown on sandy soils. Experiments 
at the Pennsylvania station have shown that high yields 
may be secured on limestone soils. Early sowing is im- 
portant to secure full yields. 
Wisconsin Hollander is a selection of Danish Ball 
Head that has been developed in Wisconsin for resistance 
to that most serious disease of cabbage, the yellows. 
Danish Round Head is a strain of the Danish Ball 
Head which ripens from ten days to two weeks earlier, 
and is therefore valuable for planting when it is too late 
for setting the Danish Ball Head. 
344. The Volga Group. — Volga (Figure 68) is the 
only variety belonging to the group. Tt is highly recom- 
mended by many seedsmen and some growers are en- 
thusiastic concerning its merits. The heads are fairly 
