Grapevines Utilize Stored Nutrients for Early Growth

Researchers study how grapevines rely on reserves within trunks and roots during the start of the growing season.

Updated on Oct. 13, 2026 in Botany

Isometric editorial illustration showing a cross-section of a grapevine trunk and root system within stylized cubic layers of soil. — Researchers in Pullman found that grapevines power initial spring growth by utilizing nutrient reserves stored in roots and trunks. AI Illustration. Upload story photo >

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Should vineyard operators prioritize natural nutrient storage to reduce reliance on commercial fertilizers?

Grapevines support their initial seasonal growth by drawing upon nutrient reserves stored within their trunks and roots. These vines do not transition to absorbing soil-based nutrients until their shoots have developed five to six leaves.

Why it matters

Understanding how vines manage nutrient cycles helps growers respond to environmental stressors like cold weather. When cold spells cause premature leaf loss, vineyards must apply supplemental fertilizer in the spring to ensure healthy vine development.

Grapevines rely on internal reserves until reaching a threshold of 5 to 6 leaves per shoot. Only after this vegetative stage do the plants begin active uptake of nutrients from the soil.

The details

Vines effectively act as their own nutrient banks throughout the winter, utilizing stored pools within the root systems and trunks to power initial spring growth. This biological reliance means the health of the vine at the end of the previous season directly dictates its energy availability when new buds break.

Spring is the period when growers apply new fertilizer to compensate for leaf loss.

The Big Picture

This research follows a pattern set by the Washington State University viticulture research protocols regarding plant nutrient management in temperate climates.

For local vineyards, these findings emphasize the importance of end-of-season vine care to maximize winter nutrient storage. This knowledge allows farmers to time spring fertilizer applications more accurately, potentially improving crop yields and vine longevity.

The takeaway

Growers should monitor for early-season leaf loss, as it signals a depletion of stored reserves that requires human intervention. Proper soil supplementation in the spring is essential to bridge the gap before the vine develops enough leaves to sustain itself from the ground.