4 BULLETIN 1174, U. S. DEPARTMENT OF AGRICULTURE. 
of development hot weather retards the growth of the plants, and 
in its later development it checks both the growth of the plant and 
the development of seed. While Hungarian vetch stands colder 
winters than common vetch (Vicia sativa) it is not as winter hardy 
as hairy vetch (Vicia villosa). In experimental plantings at Raleigh, 
N. C, Knoxville, Tenn., Fayetteville, Ark., Athens, Ga., Auburn, 
Ala., and other places in the South it has proved entirely winter 
hardy. At the Arlington Experimental Farm in Virginia it survived 
the winters specified below with the following minimum tempera- 
tures: 1915-16, 6° F.; 1917-18, 3° F.; 1918-19 and 1920-21, 11° F.; 
1921-22, 25° F. It winterkilled in 1919-20 with a minimum of 8° F. 
Fig. 2.— Hungarian vetch in full bloom. 
The accompanying map (fig. 3) shows the region to which Hun- 
garian vetch is adapted for seeding as a fall crop. In regions in 
which spring planting is essential vetches seldom do well, and it is 
only under special conditions that their planting can be advised. 
SOIL AND MOISTURE REQUIREMENTS. 
One of the most striking features of Hungarian vetch is its ability 
to grow on heavy wet lands and still produce a fair crop. (Fig. 4.) 
It will stand much wetter soil conditions than common vetch or 
hairy vetch. In experimental tests at Corvallis, Oreg., it has done 
quite well on poorly drained •'white land" on which common vetch 
would not survive. While this vetch does better than others on 
wet lands, it makes its best growth on a good loam soil that is well 
drained. It also seems to stand dry weather as well as any other 
of the vetches, but none is adapted to such conditions. 
