Hello, I’m interested in trying to prepare biological concrete that is covered with moss, because concrete is an alkaline medium, and acidity Ph 5.5 is necessary for life,
colleagues from Spain did it https://www.dezeen.com/2013/01/03/spanish-researchers-develop-biological-concrete-for-moss-covered-walls/
It’s clear from the article that they use three-layer concrete, where the first layer with high acidity is made of magnesium phosphate, the second layer is water-retaining and the third for strength, the question arises whether there are any pitfalls and magnesium phosphate is sold in your region. Has anyone worked with this cement? https://russian.alibaba.com/product-detail/fire-resistant-magnesium-phosphate-cement-62203385352.html

P.S. if something sorry for my english, used google translator =)