Mulching beds has become extremely popular these days, and mulch can be really beneficial to your plants and the soil in your planting beds, but there are things you need to watch for.
Here in Ohio the most popular type of mulch that people use is shredded hardwood bark mulch, which is a byproduct of the timber industry. When they haul the logs into the sawmill the first thing they do is debark them. Years ago the bark was a huge problem for the mills because there didn’t seem to be a useful purpose for it, until people realized the hidden benefits that it held. Still to this day, the bark is a headache for the saw mills, and they don’t always understand how to properly handle it.
They like to pile it as high as they can so it takes up less space in their yard. The mulch really tends to back up during the winter months because there is little demand for it. In order for the mills to pile the mulch high, they literally have to drive the large front end loaders up onto the pile. Of course the weight of these large machines compacts the mulch in the pile, and this can become a huge problem for you or I if we happen to get some mulch that has been stacked too high, and compacted too tightly.
When the trees are first debarked the mulch is fairly fresh, and needs to decompose before we dare use it around our plants. The decomposition process requires oxygen and air flow into the pile. When the mulch is compacted too tight, this air flow cannot take place, and as the mulch continues to decompose it becomes extremely hot as the organic matter ferments. Sometimes the extreme heat combined with the inability to release the heat can cause the pile to burst into flame through spontaneous combustion.
In other cases the mulch heats up, cannot release the gas, and the mulch actually becomes toxic. When this occurs the mulch develops an overbearing odor that will take your breath away as you dig into the pile. When you spread this toxic mulch around your plants the gas it contains is released, and this gas can and will burn your plants.
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