Japanese Pumice (Hyuga), Small, 3-6mm
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Japanese Hyuga Pumice for Bonsai, Orchids and Succulents
Japanese Hyuga Pumice is a porous volcanic growing medium sourced from southern Miyazaki Prefecture, Japan. This small 3–6mm grade provides a durable mineral component for bonsai, orchid and succulent mixes, helping balance moisture retention with drainage and air around the roots.
Why use Hyuga pumice?
- Porous granules: retain some moisture within the particles while allowing excess water to drain through a suitably structured mix.
- Root-zone aeration: helps maintain spaces between particles for air movement.
- Lasting structure: resists decomposition, unlike organic ingredients that gradually break down.
- Versatile particle size: the 3–6mm grade suits a range of container-growing applications where a smaller mineral aggregate is required.
For bonsai growers
Combine with Ibaraki Hard Akadama, Small, 3–5mm to create a mineral-based bonsai mix with closely matched particle sizes. A 1:1 blend is a useful starting point rather than a fixed recipe. Adjust the proportions for the tree species, pot depth, climate and watering routine. More akadama can increase moisture retention where appropriate.
For orchid growers
Use as a mineral component alongside Premium, Treated Orchid Bark to help maintain an open growing mix. Where an orchid needs additional moisture retention, incorporate a suitable amount of Rehydrated Sphagnum Moss. Match the mix to the orchid's root structure, preferred moisture levels and the airflow in your growing area.
For succulent growers
Blend into succulent growing media to increase the mineral component and encourage drainage. Combine with small-grade akadama where additional moisture retention is useful, or adjust the organic portion of your preferred mix to suit the species. Choose particle size and proportions according to the plant's roots, container and growing conditions; very small seedlings may need a finer grade.
Preparation and ongoing care
Sieve or rinse away loose dust before use and plant into containers with unobstructed drainage holes. Assess moisture within the mix before watering: pumice does not prevent overwatering or eliminate root rot. Continue feeding and inspect roots and growing media periodically, even when the mineral particles remain structurally sound.
Hyuga can be sifted for reuse, but remove old roots and debris and clean it appropriately before using it again. Avoid transferring used medium from diseased plants to healthy plants.


