Which statement about late-budding varieties is true?

Which statement about late-budding varieties is true?

• A. They bud later and require higher temperatures
• B. They bud earlier
• C. They bud regardless of temperature
• D. They require lower temperatures

Answer: (A)

Budbreak in grapevines is driven by the accumulation of warmth after dormancy. Late-budding varieties have a higher heat requirement to wake up, so they need more warmth to reach the threshold for budbreak. Because of this, their buds open later in spring, and they rely on higher temperatures to trigger the break. That’s why the statement that they bud later and require higher temperatures is the true one. The other ideas—budding earlier, budding regardless of temperature, or needing cooler temperatures—don’t fit with the concept that heat accumulation governs when these varieties wake up.

Budbreak in grapevines is driven by the accumulation of warmth after dormancy. Late-budding varieties have a higher heat requirement to wake up, so they need more warmth to reach the threshold for budbreak. Because of this, their buds open later in spring, and they rely on higher temperatures to trigger the break. That’s why the statement that they bud later and require higher temperatures is the true one. The other ideas—budding earlier, budding regardless of temperature, or needing cooler temperatures—don’t fit with the concept that heat accumulation governs when these varieties wake up.