ISA Certified Arborist Practice Exam 2025 - Free ISA Arborist Practice Questions and Study Guide

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What is the importance of mulch for trees?

It enhances the beauty of the garden.

It helps retain soil moisture and regulate soil temperature.

Mulch plays a crucial role in the health and growth of trees primarily by helping to retain soil moisture and regulate soil temperature. When applied around the base of trees, mulch acts as a barrier that reduces evaporation from the soil, which is particularly beneficial during hot and dry periods. This helps maintain adequate moisture levels in the soil, allowing trees to thrive. Furthermore, mulch provides insulation to the soil, keeping it cooler in the summer and warmer in the winter. This temperature regulation is important for root development and overall plant health.

Additionally, mulch can suppress weed growth, which competes for water and nutrients, and can improve soil health over time as it decomposes and adds organic matter. This creates a more favorable environment for the tree's roots, ultimately supporting its growth and stability.

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It increases the number of insects around trees.

It prevents trees from growing too tall.

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