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Pea gravel can retain some heat, but it generally stays cooler than materials like concrete, asphalt, or stone pavers. Lighter-colored pea gravel reflects more sunlight and tends to stay cooler, while darker-colored gravel can absorb heat and become warmer to the touch.

Replace organic mulch every one to two years, depending on the variety. Wood chips and straw, for example, will last a couple of years, while grass clippings and pine needles need replacing every several months. Inorganic mulch—such as rock and rubber chips—can stay in place for up to four years, depending on erosion and general garden upkeep. 

Some drawbacks of forestry mulching include leaving behind a thick mulch layer, not being suitable for extremely rocky areas, creating conditions that attract pests, and not being able to fully remove large trees and stumps. You may need to pay extra to have larger trees felled and stumps ground in order to fully clear your land.

It can be tedious and time-consuming to install your own mulch and determine the ideal amount. A professional can help you ensure the right thickness and save you a lot of time and headaches.