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Colored mulch can be bad for plants in that it robs them of nitrogen as it depletes the soil to break itself down. With this in mind, it’s a good idea to test your soil to check the nitrogen levels. If the nitrogen levels are low, use fertilizer with extra nitrogen or switch to regular mulch.

Another downside of colored mulch is if it’s heavily contaminated, it can contaminate the soil and damage your plants. To avoid this, look for the MSC certification logo on the mulch bag before purchasing.

Yes, it is possible to add too little mulch. Anything less than 1 inch will likely result in too little coverage around your plants, allowing weeds to grow through and minimizing the positive effects that a deeper bed of mulch would have, like maintaining proper soil moisture and insulating the ground.

Mulch is made from natural materials, which will break down and add nutrients to your soil for better plant and soil health, so removing old mulch is unnecessary before putting down new mulch. However, if you live in a particularly moist area, it’s possible that the old mulch will harbor fungus or mold, which can hurt plant health. If you notice these issues, you might want to consider removing the old mulch first. Otherwise, save time and money by placing new mulch right over the old mulch.

You can choose from various kinds of organic mulch and inorganic mulch. Organic mulch may be in the form of wood chips, pine needles, and compost and eventually decompose. Inorganic mulch, such as gravel, rocks, and landscape fabric, is more durable but doesn’t help the soil.