I usually add shells
I keep all egg shells we used for cooking (in the city), squash them to pieces and when summmer season comes, add them to the soil (preferrably to irises), this makes our heavy soil a bit lighter... @nikv
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Shells can be useful in this way too.
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Really interesting!!
Have you heard of using Zeolite chips in soil? It has a similar effect and also absorbs nutrients so they aren't lost to leaching