326 VEGETABLE FORCING 
tying is necessary to secure the leaders to the wires of 
the trellis. This system of training is best adapted to 
varieties that are most vigorous in growth, such as the 
English type. It is necessary to set the plants 4 or 5 feet 
apart in order to have sufficient space to train up the 
branches. 
The arbor (or modified upright) system of training is 
well illustrated in Figs. 114 and 115. With this system 
of training a single stem is grown until it reaches the wire 
arbor at a height of about 6 feet from the ground. The 
laterals of this stem are pinched just beyond the first 
female blossom, but, as a rule, not more than five or six 
cucumbers are allowed to develop below the trellis. After 
the main stem is pinched back, branches grow out in 
every direction and soon cover the trellis, forming an 
arbor with the cucumbers suspended below. A certain 
amount of pruning is then necessary to prevent too much 
vining. This system is especially well adapted to the 
Abundance or other American-English crosses. The 
main stem is supported by a string and the trellis is made 
of No. 16 wires, 6 inches apart, running through light 
strips placed at intervals of about 8 feet. 
The A-form system is largely used in the United States. 
It is popular in New England and also in western forc- 
ing sections. The system as shown in Fig. 113 is con- 
sidered highly satisfactory by many growers, especially 
in the amount of light and sunshine which each plant re- 
ceives. The trellis may be made of wires placed about 
10 inches apart, running through 2 by 4 scantlings, which 
are connected in the form of the letter A sufficiently close 
to give proper support to the wires and plants. Single- 
stem plants are trained over the trellis, by tying them as 
they reach each wire, until they reach the last wire, when 
the tops are nipped. All of the laterals are also nipped, 
ustially just beyond the first female blossom. Secondary 
laterals may be allowed to develop if desired, but this is 
