Fresh Cedar Chip Mulch Problems
Fresh cedar mulch has many advantages in the garden. It has a bright appearance and fresh aroma, is economical and spreads well. Cedar mulches regulate soil temperature and conserve moisture. They may prevent soil erosion and weed growth, as well. A few problems are associated with cedar chip mulches, but they are easily remedied. The benefits of cedar mulch generally outweigh any potential negatives. Does this Spark an idea?
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Nitrogen Loss
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When used as a mulch on top of beds, cedar chips do not deplete the soil of nitrogen. However, if the cedar chips are incorporated into the soil, they temporarily tie up nitrogen during the decomposition process and may cause a nitrogen deficiency in plants. Do not use cedar mulch chips on annual beds or vegetable gardens because these areas are frequently tilled up for seasonal planting, and the cedar chip mulch complicates the planting process.
Damage to Plants
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Cedar mulch is often blamed for damaging plants by releasing volatile compounds into the soil. According to Dr. Linda Chalker-Scott of the Washington State University Extension Center, little evidence exists to support these claims. She believes that cedar mulches are safe to use around plants and that plant damage is likely caused by other conditions, such as lack of light or nutrients. Mulches labeled "Eastern Red Cedar," or "Western Red Cedar" are not made from cedar at all, but junipers or arborvitae, further reducing concerns over product safety.
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Toxic Mulch
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Cedar mulch, as well as other types of wood mulch, may leach toxic chemicals, such as ammonia and acetic acid, that can scorch, or even kill plants. These gases form when mulches are improperly processed and stored. If you buy mulch that smells like silage, rotten eggs or vinegar, rather than fresh wood, don't apply it immediately, but spread it out on a driveway or patio to air out. The toxic gases dissipate within a day or two, making it safe to use on the garden.
Uses
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Lay a 1- to 2-inch layer of small cedar chip or shredded cedar at the base of trees and in established perennial beds. Apply 3 to 4 inches of larger chips, which allow oxygen to flow more freely than smaller chips. Although cedar chips don't work well in vegetable gardens, they make an excellent mulch for paths between raised beds. Don't mound mulches around the trunks of trees and shrubs. The mulch reduces oxygen flow and leads to rot and disease.
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