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If you like the look of mulch in your plant beds, be aware that it can attract a variety of pests, including termites. To avoid wood-to-foundation contact, leave a one-foot barrier around your house and fill it in with rocks or gravel, starting mulch past that barrier and working it outward into your plant beds. 

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.

Nonorganic mulch, like river rocks, pebbles, or lava rock, technically lasts the longest. It helps with moisture retention and weed control but doesn’t break down and release nutrients like organic mulch. Wood mulch decomposes slowly, which can help it last longer than leaf or straw mulch, but it won’t provide as many nutrients as quickly as the faster decomposing types.

Wood from black walnut, magnolia, eucalyptus, red maple, and invasive species like tree of heaven are not recommended for mulching. These trees release allelochemicals that can suppress plant growth. Some homeowners, however, use wood from these trees for mulching if it is less potent due to age or concentration, or if the plants are not as sensitive to them.