What is the term for the part of the vine that does not produce fruit?

The term for the part of the vine that does not produce fruit is "non-fruitful wood." This refers to sections of the vine that are not responsible for bearing grapes and are primarily involved in the vine's overall structure and health. Non-fruitful wood contributes to the strength and support of the vine, allowing it to grow and maintain its balance as it develops fruit-bearing wood during the growing season.

In contrast, fruitful wood is specifically associated with sections of the vine that do produce fruit, such as one-year-old canes. The canopy refers to the upper layer of foliage in the vineyard, which is crucial for photosynthesis but not a term used to denote wood that doesn’t produce fruit. Trunk wood, while being integral to the vine's structure, is distinct from non-fruitful wood as it usually refers to the body of the vine itself, which supports all other parts, both fruitful and non-fruitful. Thus, choosing "non-fruitful wood" accurately identifies the portion of the vine that does not engage in fruit production yet plays an important role in the vine’s overall vitality.