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Japanese Lava Stone, Medium, 0-10mm

27 reviews
22 items left

Each bag contains unwashed Lava Stone in Medium, 0-10mm particle size.

Crushed lava stone or its Japanese name, Fujizuna is an attractive and entirely natural product being a volcanic byproduct, for use in aquariums, terrariums, and forms an important component in bonsai tree and succulent mixes when combined with akadama and pumice.

For bonsai

Lava rock or scoria as volcanic rock is also referred to, adds spacing or passageways through which air can flow and prevents compaction of growing mediums. It has a potentially long lifespan as it does not break down and can thus be reused. Due to its high porosity it allows water and fertilizer penetration and storage.

The most popular mix containing lava would be 1 part small lava:1 part small akadama:1 part small pumice. To increase water retention use more akadama (eg when potting deciduous trees) This is affectionately known as the 'Boon mix' after its author bonsai professional Boon Manakitivipart. 

For aquariums

Lava stone is very effective at creating the ideal living environment for your aquarium as due to its porosity it provides plenty of surface area for beneficial denitrifying bacteria to develop. This beneficial bacteria has the ability to improve water quality by removing nitrates. Shrimp will also forage on Lava stone as small particles of food may become lodged in the millions of open cavities. Lava stone is also extremely popular with cichlid enthusiasts in their tank setups.

Lava stone has an SG greater than 1.0. It does not float in water.

For succulents

Much of the advantages of using crushed lava stone in a growing mix has been covered in the bonsai section and I dare say that the same 'Boon mix' would be ideal for many succulents. Essentially the lava stone provides structure to the medium as it does not degrade and is a very porous particle which retains moisture but permits free flow of air. 

Particle Distribution

  • +-20% smaller than 2.4mm
  • +-45% 2.4mm - 4.8mm
  • +-35% larger 4.8mm - 10mm
Customer Reviews
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Filter Reviews:
    Bonsai Tree Japanese Lava Stone, Medium, 0-10mm Review

    Japanese Lava Stone

    I started using the Lava stone with Akadama and Pumice last year and have had excellent growth on my trees especially Junipers.

    Joe V.
    South Africa South Africa

    Bonsai Tree

    Thanks Joe for the review and I am so glad you are happy with the results! Great tree in the making.



    Excellent product that I am currently using for Bonsai, Aquarium Filtration media and Terrarium drainage substrate too.

    David B.
    South Africa South Africa

    Lava stone

    Using Japanese lava stone as part of the substrate for a bunch of my bonsais was a very good idea. Drainage is ideal and the trees are looking great. Definitely worth the investment. Also, thanks Terry for all the free items you despatch with my consignments. Much appreciated.

    Robert Q.
    South Africa South Africa

    Japanese lawa stone review

    I must say it works really well and the size stone help for drainage and air ration . Will buy it again.

    Divan B.
    South Africa South Africa

    Satisfied with the Japanese Lava Stone, Small, 0-5mm

    it was great good colour and texture really happy with the product

    Prashik S.
    South Africa South Africa