Well, Hypertufa is an artificial stone used for making, amongst other things, garden ornaments, pots and troughs. It is made from various aggregates and bonded together with Portland cement. It’s used as a alternative to natural tufa, which is a slowly precipitated limestone rock.

A Hypertufa pot is very porous which makes it good for plant growth. It is also fairly light in comparison to other pots made from terra cotta or concrete and can cope with low temperatures down to -30C.

I hope that gives you a quick overview of Hypertufa. You can find further information about Hypertufa on this site. Also I highly recommend The Hypertufa How To Manual by Claudia F. Brownlie.