Calcined clay

Calcined clay, pumice, a patented item known as Turface, or another highly acclaimed product from Japan known as Akadama, are all used by bonsai enthusiasts.

Idon't live that close to a tesco but I do live quite close to a Wilkinsons store which does a calcined clay cat litter." ...

See also: Plant, Tree, Pruning, Chlorophyll, Bark