ISA Certified Arborist Practice Exam 2026 – All-in-One Resource for Comprehensive Exam Success!

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What does "hardening off" refer to in the context of young trees?

Increasing sunlight exposure

Gradually acclimating them to outdoor conditions

"Hardening off" in the context of young trees specifically refers to the process of gradually acclimating them to outdoor conditions. When young trees are initially grown in controlled environments, like greenhouses or nurseries, they can become accustomed to higher humidity, less wind, and filtered sunlight. To successfully transition these young trees to an outdoor environment, it's important to expose them to increased sunlight, wind, and variable temperatures over time. This gradual exposure helps them develop a stronger tolerance to stressors and reduces the risk of shock or damage when they are finally planted outside.

The process involves taking the trees outside for short periods, gradually increasing their time outdoors over several days or weeks, which allows their physiological functions to adjust accordingly. This acclimatization is critical for ensuring the long-term health and success of the plants once they are planted in their permanent locations.

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Applying fertilizer before planting

Watering them more frequently

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