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Kiryuzuna is a Japanese substrate of volcanic origin that is widely used in bonsai cultivation, particularly for coniferous species such as pines and junipers.
Its main feature is its excellent drainage, allowing water to flow efficiently and preventing excess moisture from reaching the roots, thus preventing rotting. In addition, its granular structure provides good aeration, ensuring that the roots have access to the oxygen they need for healthy growth.
Another benefit of Kiryuzuna is its ability to retain nutrients and gradually release them, offering more effective fertilization. Kiryuzuna can be used mixed with other substrates, such as Akadama and volcanic sand, depending on the needs of each plant. Its slightly acidic pH is ideal for conifers, where it is common to use it in greater proportions to ensure efficient drainage and pH regulation.
In deciduous species, it can be mixed with Akadama to balance moisture retention. It can also be used in the drainage layer at the bottom of the pot, further improving air and water circulation.
If you want to keep bonsai strong and healthy, Kiryuzuna is an essential substrate, offering an ideal balance between drainage, aeration and nutrition for the roots.