the University of Georgia Cooperative Extension
Gerard Krewer, Extension Horticulturist, University of Georgia, College of Agriculture and Environmental Sciences
Trellis Systems and Trellis Construction
Excerpts from the Home Garden Bunch Grapes publication
American Type Bunch Grapes
type bunch grapes are vigorous and have a trailing, downward growth
habit. Three high trellis systems are commonly used to train home
garden American type bunch grapes in the south: the double curtain (two
wire horizontal system), the two wire vertical and the single wire. The
top wire is typically 5 feet to 5½ feet above ground level in
all three systems.
The Double Curtain Trellis
— This trellis system is usually the most desirable of the three
systems because of increased yields. The trellis system has two wires 4
feet apart and 5½ feet above the ground. Fig. 1 and Fig. 2 show
details of how to construct the double curtain trellis. A simple T-bar
trellis constructed from treated 4" x 4" posts can also be used.
Details for constructing the Double Curtain trellis
Details of the Double Curtain support system
The Two Wire Vertical Trellis —
The two wire vertical trellis used for the four-arm Kniffin training
system is considerably less expensive to construct than the double
curtain trellis. However, shading of the foliage on the lower fruiting
canes by the upper canes reduces the quality and productivity of the
grapes on the lower wire. Fig. 3 illustrates the construction of the
two-wire vertical trellis. The primary use for this trellis is in
situations where space is limited, but where there is good direct sun
exposure. If direct sun exposure is limited, use the double curtain or
single wire trellis.
Dimensions of a two-wire vertical trellis
(four-arm Kniffin), showing end braces. Fig. 3. Dimensions of a
two-wire vertical trellis (four-arm Kniffin), showing end braces.
Dimensions of a two-wire vertical trellis (four-arm Kniffin), showing end braces
Single Wire High Trellis
— This trellis is recommended where diseases are a problem. The
vines dry off more rapidly after a rain on the single wire. Space the
vines 10 feet apart when using this trellis. Yields are lower than the
other two systems, but construction is easy. Construct end supports as
shown in Fig. 3.
French Hybrid and European Bunch Grapes
for constructing the Single Wire Low Trellis with Catch Wires. View
looking down the row. Special nails or a bend nail can be used for the
Single Wire Low Trellis with Catch Wires (AKA Low Trellis Cordon System)
— French hybrid and European bunch grapes have new shoots that
naturally grow upward. Two removable catch wires above the cordons
(arms) further encourage this growth habit and allow good exposure of
the fruit to sunlight and fungicide sprays.
The low-trellis cordon
system establishes the cordons 3 to 3.5 feet above the ground and
includes two removable catch wires positioned at 10 inch intervals
above the cordon wire. This system promotes vertical growth, resulting
in a narrow, upright vertical canopy. (Fig. 4).
Home Garden Bunch Grapes from the University of Georgia Cooperative Extension pdf 8 pages
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