[papercreters] Papercrete as growing medium

I'm intersted in the possibility of using paper pulp / papercrete as a growing medium. Added cement looks like an unideal choice because of chromium and who knows what else in it, so is there anything else that could provide enough strength to stop the paper pulp liquifying when soaked? The current plan is to reinforce it with sticks to hold it up, I just need it to not liquify in heavy rain or when saturated.

Cost is critical, I'm looking for the cheapest option if possible.

thanks




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