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Ibaraki Hard Akadama, Medium, 5-8mm

18 reviews
10 items left


  1. Consistent particle size = 5 ~ 8mm
  2. High quality Ibaraki brand akadama
  3. Hard type (retains shape longest)
  4. Promotes exceptional, healthy growth.
  5. Great for rooting all forms of cuttings.
  6. Exclusively imported from Japan by Bonsai Tree.
  7. Available in 2L bag, 5L bag and 14L bags.


Akadama is a granular volcanic clay-like (although it is not clay) mineral which occurs naturally in Japan. It has been extensively used by Japanese gardeners and bonsai artists for many centuries as a growing medium for bonsai trees and other container-grown plants. It is mined from the surface of the ground, after which it is graded and packaged. Unlike LECA it is not fired at high temperatures however when it is mined from greater depths it tends to be harder or it might be slightly baked. It has many unique qualities, one of which is that when it is wet it has a darker colour so indicates when watering is needed. Akadama is unique as a growing medium and is sought after due to its ability for water retention and nutrients due to its high CEC value. However at the same time it provides porosity and free drainage.


Do not mix with organic material.

  1. This medium (5 ~ 8mm) particle size akadama is suited to large trees and for a drainage layer.
  2. Akadama can be combined with other elements such as crushed stone or for best effect use pumice

For typical growing conditions, a ratio of 1(akadama) : 1(pumice) can be used. For plants which prefer more moisture you can double the quantity of akadama.

See other sizes of akadama available from us

Customer Reviews
4.9 Based on 18 Reviews
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    Bonsai Tree Ibaraki Hard Akadama, Medium, 5-8mm Review

    Japanese Akadama

    I use Japanese Akadama in my shrimp tanks as a secondary substrate. This safely lowers the pH of the water. I will be trying a Akadama only tank in the future and will review my 4star rating accordingly.. Very happy with the service I've received. 5 stars for that.

    Robert R.
    South Africa South Africa

    Well but next time i'll buy the smaller ones !!!!!

    South Africa South Africa

    Hard Akadama

    Bonsai Tree recommended Hard Akadama as part of my substrate mix and I am glad I followed their advice. This is an excellent product.

    Robert Q.
    South Africa South Africa

    Ibaraki Akadama works very well as part mixture with pumice and lava stone for my pines. Excellent, speedy service from Bonsai Tree! Thank you.

    Very pleasant. The product was well-packaged and speedily delivered.

    Gary N.
    South Africa South Africa

    Medium Ibaraki Akadama

    Bought this for my orchids, it seems to have pretty good water retention and aeration. Will be using this for my bonsai trees as well. Thank you as well for the speedy delivery and excellent service :)

    Ike G.
    South Africa South Africa