![]() ![]() In order to get the diameter, measure it’s circumference and multiply it by pi (3.14). So once you have the circumference, you just multiply the diameter of the trunk by 1.5, and then you will have the proper radius for your trees critical root zone. The general rule of thumb is that for every inch of tree trunk, the radius increases by 1.5 feet. Be sure to measure the trunk at 4 feet above the ground to ensure an accurate measurement. To determine the actual radius of your tree’s CRZ, you must first measure the circumference of the tree trunk. You will need a long tape measurer, something to write with, paper to record your measurements, and a calculator to multiply your numbers. Although you can estimate your tree’s CRZ by looking at the drip line, it is better determined by measuring it. ![]() These are the roots that require the most protection and care. That is why it is also called a “protection” zone. This area is important to a tree because it is where the most critical tree roots are located beneath the ground. Essentially, it is an invisible or imaginary circle that runs along or just outside the drip line of a tree. The critical root zone of a tree is also referred to as a tree protection zone. All you need to get started is a tape measurer, a pencil, and a calculator! Indianapolis Tree Service 31 Tree Protection Zone You can do it all on your own and even include your kids for a great learning experience. ![]() Continue reading to learn more about a tree’s critical root zone and how to measure yours. It is important to know how to locate and measure your trees CRZ so that you may better protect it from inclement weather and pests. In fact, in terms of tree health, mulch is just as important as fertilizer and water. Adequate mulching is an effective method for protecting your tree’s critical root zone or CRZ. ![]()
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