I wander around general gardening blogs a lot, and one of the topics that comes up every now and then is hypertufa, the super-light-weight concrete substitute that people shape into various kinds of custom containers for their plants. Looking at a typical recipe (this one from Wikipedia), it sure looks like a good way to use up old CP mix (particularly if you use perlite instead of sand).
PS: I'd add that I wouldn't use any of these containers for CPs since the containers would be pretty alkaline. But there are other plants in the world. Really.
- 3 parts Type I Portland cement
- 4 parts Sphagnum
- 5 parts perlite
PS: I'd add that I wouldn't use any of these containers for CPs since the containers would be pretty alkaline. But there are other plants in the world. Really.