How Much Mulch Is Too Much Mulch?

Pass through any residential street in the suburbs and you'll probably notice trees with mulch piled up high around their bases. In gardening lingo, this is called a “mulch volcano,” something not only unnecessary—and a waste of mulch—but also harmful to the tree.

Mulching, when done properly, is one of the most important gardening tasks, especially in the spring. Roger Swain, the legendary host of the PBS television show The Victory Garden, wrote, “If I did nothing more, I would mulch.” Similar to watering, fertilizing, and applying other products—organic or not—to your plants, more is usually not better; you need to strike the balance between being generous and overdoing it.

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