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Japanese Kanuma, Mixed particles

9 reviews
2 items left

What is it?

Japanese Kanuma comes from Kanuma City in Tochigi, Japan and is the result of a volcanic eruption by Mount Akagi around 45,000 years ago.

Why use it?

Kanuma is a very porous, soft particle which easily absorbs and retains moisture. Kanuma has a pH value of between 4.5 - 5.5.

The acidic nature of the Kanuma makes it ideal for all acid loving species such as camellias, rhododendrons, gardenia and more. It is also a popular component in carnivorous plant mixes for plants such as Nepenthes and can be mixed with long fibre moss or crushed lava stone.

As it is soft, fibrous roots such as those from the Azalea for example can penetrate the particle. This means smaller containers can be used as the tree can better utilize the full volume of the container.

How to use?

Do not mix Kanuma with organic material.

You can however mix some suitably sized (SMALL) akadama to the Kanuma, in a quantity of up to 20% of the mix which will help to hold the soil structure for longer.

As Kanuma is very soft and can create dust easily it is best to handle the product as little as possible. When seating a tree onto a layer of Kanuma, do not force or "jiggle" the tree back and forth over the Kanuma as this could crush some of the particles.

When using an implement to work Kanuma into the root ball, do so very gently so as to avoid breaking particles.

If you are used to watering very water retentive mixes containing organics then some adjustment to your routine might be required. Generally though, watering daily is all that will be required unless your climate is particularly dry and your plant is perspiring a lot. 

Customer Reviews
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Filter Reviews:

    Amazing product

    Repotting my Azaleas have always been stressful as they are so precious, but challenging (lost my first one years ago that left me in months of mourning). When I used the Kanuma this season I was again quite nervous. BUT, what a result - they are thriving beyond expectation!!! This is worth more than the cost and I will never use any other product. Thank you Terry - this has been a transformation for me and my Azaleas. Louise

    South Africa South Africa


    Best growing medium for Azalea and Camelia, and great quality and very helpful that it’s in various particle sizes!

    Dirk G.
    South Africa South Africa

    Kanuma for the win

    Anyone that is not using Kanuma for growing their Azaleas are just missing out on getting their Azalea plants to their full potential.

    Paul M.
    South Africa South Africa

    Japanese Kanuma

    Highest quality Kanuma. Great service from the Bonsai Tree team. Thanks very much!

    Keren O.
    South Africa South Africa

    Kanuma Soil Medium

    Having used the product before to develop my Azalea, I can honestly say this product is magic. Despite its soft texture, it still maintains its acidic properties from start till you repot. A really fantastic product that keeps the guesswork out of maintaining the ideal ph balance to develop rhododendrons optimally. Thank you. Hassim Gora Khaki.

    Hassim G.
    South Africa South Africa