Start Plants in Cinder Blocks
I can't state this any plainer, DON'T use cindercrete blocks for planting edibles. They use fly ash in the production of the blocks. It is toxic to humans. They make concrete blocks, no fly ash, a different process is used. I have to admit that I stumbled across...
Planting In Cinderblocks
Cindercrete blocks use fly ash in the manufacturing process. It is very toxic, do not plant edible plants in them!