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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. 

Organic mulch typically lasts between 4 to 6 years. However, factors like the type of organic mulch you choose, mulch size, and weather conditions can all play a role in its longevity. In some cases, you’ll need to replace organic mulch every few years.

Mulch costs an average of $15 to $80 per yard, depending on the type you choose and whether you have it delivered and installed by a pro. Generally, it’s cheaper to buy mulch in bulk and have it delivered to your home. However, bags are the more cost-effective choice if you only have a small area to mulch.

First, dig a hole that’s the same depth as the root ball and wide enough for the roots to spread out fully. Before placing the tree in the hole, pour water in to help get rid of any air pockets in the soil.

When filling the hole back in, opt for a 1:1 ratio of organic compost with the soil left over from the ground. Do not use potting soil, fertilizer, or chemicals of any kind, as these can stress out and kill your newly planted tree.