Single-ingredient Kanuma
Pure Kanuma in a 2.5 L pack, with no added fertiliser, for standalone use or targeted blending.
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Kanuma Bonsai Mix 2.5lt (5mm)
Normal price
€10,00
Acid-loving bonsai · Japan · 2.5 L · 5 mm
Kanuma Bonsai Mix 2.5 L · 5 mm
Kanuma is a naturally acidic, granular Japanese substrate for azaleas and other acid-loving bonsai. The medium grade of approximately 5 mm combines high moisture retention with good permeability, giving roots access to water without creating a heavy, closed mix.
Acidic pHFor acid-loving plants
2.5 LActual pack size
5 mmMedium grade
JapanOrigin
Composition & profile
Pure Kanuma with a naturally acidic profile
Kanuma is a granular Japanese clay material. Use it alone for acid-loving bonsai or add it to another mix when a more acidic profile and greater moisture retention are needed.
- Naturally acidic pH: Matches the needs of azaleas, camellias, gardenias, hydrangeas, rhododendrons and other acid-loving plants.
- Porous grains: Hold useful moisture between waterings without turning the substrate into a dense mass.
- Good permeability: Allows water and air to move through the root zone when the container has unobstructed drainage holes.
- Clean mineral base: Contains no added fertiliser, allowing nutrition to be managed separately for the individual plant.
Moisture for acid-loving bonsai
Kanuma retains more water than many other granular bonsai substrates, helping roots maintain steadier access to moisture.
Drainage and aeration
The granular arrangement keeps pathways open for water and air, provided the material is not heavily compressed and the pot drains freely.
Control over the final mix
Use it alone or in a variable ratio with other materials, adjusting moisture and acidity to the species and climate.
Use & repotting
For azaleas and other plants that prefer an acidic root zone
Best suited to acid-loving bonsai and plants such as azalea, camellia, gardenia, hydrangea and rhododendron. Final use should reflect the species, container and growing conditions.
- Azalea
- Camellia
- Gardenia
- Hydrangea
- Rhododendron
- Acidic bonsai mixes
If visible fine dust is present, sieve or rinse the material lightly without prolonged soaking.
Use Kanuma alone for suitable acid-loving bonsai, or combine it with another mineral material to adjust moisture and drainage.
Work the grains gently between the roots and secure the plant without crushing the material.
After repotting, water evenly and allow all excess to leave through the drainage holes.
Higher moisture retention requires checking the pot itself
Do not follow a fixed watering calendar. Check moisture inside the substrate, the weight of the pot, the season and airflow before watering again.
In the pack
Kanuma Bonsai Mix · 2.5 L · 5 mm
Granular Japanese Kanuma with a nominal 5 mm grade. As a natural product, it may show small differences in colour and grain size between batches.
Use
Standalone substrate or mix component
Use it alone for suitable acid-loving plants or blend it with other materials to adjust moisture and pH.
Storage
Close the pack securely and keep it in a dry, shaded and covered place. Protect the material from rain, contamination and excess moisture.
Technical details
The verified Kanuma profile
The details below are limited to characteristics confirmed for this product and its pack.
MaterialKanuma
FormGranular · 5 mm
pHAcidic
OriginJapan
Pack size2.5 L
Added fertiliserNone
UseAlone or in a mix
Main functionMoisture & drainage
Two complementary mineral options
Choose Akadama as a versatile bonsai base, or Kiryu when you need a harder structure and faster drainage, especially for conifers.
Frequently asked questions
Quick answers about pH, suitable plants, blending, watering and feeding.
01What exactly is Kanuma?
It is a granular Japanese clay substrate with a naturally acidic pH. It retains useful moisture while remaining permeable to water and air.
02Which plants is it suitable for?
It is primarily suited to azaleas and other acid-loving plants, including camellias, gardenias, hydrangeas and rhododendrons.
03Can I use it on its own?
Yes. It can be used alone for suitable acid-loving bonsai, or mixed with other mineral materials to adjust moisture, drainage and pH.
04How does it affect watering?
Kanuma retains more moisture than many other bonsai substrates. Check the material inside the pot before watering again rather than relying on a fixed calendar.
05Does it need rinsing or sieving?
Only if visible fine dust is present. Light sieving or rinsing is sufficient; prolonged soaking is not required.
06Does it contain fertiliser?
No. It is a clean substrate with no added fertiliser. Apply feed suited to the individual plant and follow the directions on the fertiliser product.