Pressure Treated Wood For Garden
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Any wood harvested before 2003 could have been sprayed with CCA and might not be a safe choice for your raised bed.
Pressure treated wood for garden. A study of soil in raised garden beds found no increase in arsenic in soil 1-12 inches away from CCA-treated wood. This is where the problems began. The appearance of copper azole treated lumber is similar to that of CCA treated wood but has a green tint giving it the common name green wood.
Plants growing about six inches away from pressure-treated wood do not show even trace amounts of chemicals. Therefore peeling removes most of it. 1 By contrast analysis of soil adjacent to CCA-treated posts that had been in the ground for 30 years showed increases in As Cr and Cu within 6 inches of the posts but no change in soil further away.
Its because sometimes the soil holds higher levels of wood preservatives compared to the plants themselves. It completely eradicates the need for the customer to worry about protecting their shed. Pressure-treated wood is safe for vegetable garden beds but with some precautions.
If you grow edible plants in your garden then have them planted away from the edges of pressure treated wood. Marketed as Thunderbolt who thinks up these names by a company in Riverbank CA the wood is treated with a solution of 623 copper oxide and 358 citric acid dissolved in ammonia water. I took three samples at various distances from the woodimmediately adjacent several inches away and in the middle of the bed.
Brand names of this new pressure-treated wood include NatureWood Wolmanized Outdoor and Natural Select. Treated wood predating 2003 is not recommended for raised bed gardening due to the risk of chemicals being leached into the soil. 2 Analysis of soil below.
Yes the new pressure treated wood is safe for use for raised garden frames. Regular lumber begins to break down within the first year if it comes in contact with the soil so many gardeners used to use pressure treated wood for gardening such as landscape timbers and railroad ties which is chemically treated to withstand the weather. In 2003 wood treated with CCA or chromatid copper arsenate was banned in the United States.
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