-By Yang (Photos&Texts)
Kanuma Soil.
Usage of Kanuma

Use as Soil Mix
Since Kanuma soil is acidic in nature (pH 4.5-6) it is not recommend to use all alone as a growing medium for Succulents, because most succulents comfort zone is 6 to 6.5, but mix it with other soil components like rice husk charcoal, akadama, kiryu, coarse sand, gravels, and potting soil to give it a solid base.

Use as Topping
It can also be used as topping soil.
Kanuma Soil
Main Components of Kanuma
SiO2(silicon dioxide) 46.2%
CaO(calcium oxide) 2.0%
MgO(magnesium oxide) 0.36%
MnO(manganese oxide) 0.039%
Fe2O3(iron oxide) 2.20%
Al2O3(aluminium oxide) 28.7%.
EC value 0.047 ms/cm
- pH 4.5-6
What are the Advantages of Kanuma in Succulent care?

Excellent Drainage:
Kanuma soil is highly porous so it can retain a certain quantity of moisture while draining off the excess water. This allows roots to absorb the needed quantity of water without sitting in a waterlogged condition.
Visual Indicator:
It changes colour (it darkens) when wet which provides a VISUAL INDICATOR of when to water your plant.
What are the Disadvantages of Kanuma in Succulent care?
Change soil accordingly
Since kanuma soil is highly lightweight and porous, fine roots can penetrate the grains in search of moisture. This can break the structure of kanuma soil as roots develop.
By changing the soil every 2-3 years (depending on the quality of the Kanuma soil and the type of succulent) will overcome this problem.