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Are Concrete Blocks Toxic?

 
gardener
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Location: ZONE 5a Lindsay Ontario Canada
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I can't find information on this that has any 'authority'. Anybody know for sure? I have them lining a hay bale garden right now but am wondering if I should remove them. Thanks for any input.
 
pollinator
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i wouldn't think so, however, you would not want to use them by any acid loving plants as they may leach out enough product to make the soil more alkaline.
 
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Location: Denver, CO
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Have a look at this thread: https://permies.com/t/13174/organic-sustainable-practices/Toxicity-Concrete

We discussed all sorts of issues related to concrete and it'll probably help.
 
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I know a number of concrete producers are allowed to burn very toxic materials in the process of making concrete, so while it may not have a direct effect on you, concrete seems to be a bad industry
 
Travis Philp
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The blocks I have are second hand, from a nearby basement renovation so the pollution produced by block production isn't an issue here as I see it but that is good to know.
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