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vine stock 
Base of the vine on which branches grow.
vine shoot
Young well-developed branch that is at least one year old.
trunk
Main part of the vine located between the soil and the first branches.
root system
The aggregate of the roots that anchor a plant to the soil and enable it to absorb water and mineral salts from it.
sucker
Non-fruit-bearing branch produced by plants over one year old.
fruit branch
Secondary offshoot of a vine shoot; it first bears flowers, then fruit.
