What are the names of these garden wall stones?

Hello forum,

I am currently dealing with the topic of the garden and have an existing wall that needs to be renewed in some parts. Unfortunately, I can't find this type of stones anywhere! It is probably due to my incorrect designation that I enter everywhere! Can someone help?

Thank you!
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Unfortunately, I can't find this type of stones anywhere! It's probably due to my incorrect term that I enter everywhere! Can someone help?

The search engines are probably not trained on "pumice and alluvial stone products in non-standard shapes."

Do they even exist today? I still know them from my grandma's garden... Have you ever searched with Google Lens?

Google photo search says someone is selling it on classifieds id 2575842810

Hello,

hmm... they remind me a lot of pumice blocks/ pumice concrete blocks.
Take a look in hardware stores or ask suppliers specializing in historical or used building materials.

Regards,
Fabienne