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Tuesday, October 28, 2008

Training and Pruning (1)

In general greenhouse crops (tomatoes, peppers and cucumbers) are indeterminant (vining) types to take advantage of the vertical volume of the greenhouse. The plant vines are supported on vine twine by vine clips. The twine is wrapped around some sort of device from which it can be unwound (tomahook, bobbin, etc.).
Plants are trained up the twine to the wires forming a “V” shape. As the plants grow up to the overhead support wire, the twine is unwound, the plants lowered and shifted one space – “LEANED AND LOWERED”.
Tomato vines should not be lowered more than 2 feet at a time OR another good way to tell, DO NOT lower the vine such that an 80 or higher degree bend is created in the vine near the floor. High angles promote stem cracking. Plants are trained to 1-3 stems by removing (pruning) side shoots or “suckers”.
Tomatoes are trained to 1 stem (or 2 stems to replace a topped or broken neighbor
or during a season of high light, i.e., Spring or early Summer).
Peppers are usually trained to 2 or 3 stems. Their stems are much more brittle
than tomatoes and tend to snap if they are leaned and lowered.
Cucumbers have traditionally been trained using such methods as the “V-cordon”
or “umbrella”. However, they can also be trained to 1 stem like tomatoes.
*Side shoots or suckers are so named because they suck nutrients from the main plant.
The process of removing suckers = “sucker pruning” or “suckering”.


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