concrete block safety for vegetable beds

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Bonnie Martin

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Dec 4, 2015, 12:32:35 PM12/4/15

to National School Garden Network

I had a question from a school district about materials for raised vegetable beds. They asked whether concrete blocks (CMUs) are OK to use for raised beds with the concern being due to a certain amount of toxic "fly ash" within the concrete itself. Anyone heard of this or seen any data on this?

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Bonnie Martin

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Dec 4, 2015, 1:10:22 PM12/4/15

to National School Garden Network

One column that seems to have a bit more scientific heft than others. http://www.boralna.com/flyash/PDF/News-4-12-Sustainable-Design-Fly-Ash-in-Concrete.pdf

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