Bonsai Soil - Kanuma Medium Grain

Kanuma is a volcanic pumice with a PH of approximately 5.5. It can be added to other bonsai soils ...

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This guide is for bonsai enthusiasts looking for a specialized soil to enhance plant health and appearance. The key benefit is its excellent water and nutrient retention, ideal for sensitive trees. A potential caveat is its specific PH level, which may require mixing for certain species. Kanuma Medium Grain Bonsai Soil is a volcanic pumice product designed for optimal bonsai care. Its medium grain size (2-6mm) promotes aeration while retaining moisture, making it suitable for trees like Chinese Elm, Juniper, Azalea, Gardenia, and Camellias. It can be used alone or mixed with other substrates to adjust soil properties.

All features

Model Part Number	Kanuma Medium Grain Bonsai Soil
Brand	B&Q

Extended Product Information

FAQs

What is Kanuma soil made of?

Kanuma soil is a natural volcanic pumice found in Japan.

What is the PH of Kanuma Medium Grain Bonsai Soil?

The PH is approximately 5.5, making it acidic.

Can I use Kanuma soil for all bonsai trees?

It is ideal for acid-loving trees. For other species, it's recommended to mix it with other substrates to adjust the PH.

What does 'medium grain' mean for bonsai soil?

Medium grain refers to the particle size of the pumice, which is between 2mm and 6mm. This size offers a balance between drainage, aeration, and water retention.

How does Kanuma soil help with watering?

The soil's color changes as it dries, providing a visual cue. It lightens when dry, indicating it's time to water.

How should I store unused Kanuma soil?

Store it in a dry, cool place in a sealed bag to maintain its quality and prevent moisture absorption.

Is Kanuma soil heavy?

No, Kanuma soil is lightweight due to its volcanic pumice composition, which reduces the overall weight of the potted bonsai.

Troubleshooting

Soil becomes waterlogged despite good drainage

Ensure the pot has adequate drainage holes and that the Kanuma is not compacted. If mixed with other soils, check the ratio for excessive water-retaining components.

Bonsai shows signs of nutrient deficiency

Kanuma soil offers good nutrient retention but does not contain nutrients itself. Supplement with a balanced bonsai fertilizer according to plant needs and seasonal recommendations.

Plant prefers a less acidic environment

Mix Kanuma with a more neutral substrate like Akadama or lava rock to buffer the pH. A common ratio is 1:1.

Soil surface appears too dry quickly

While Kanuma retains moisture well, very hot or windy conditions can increase evaporation. Ensure thorough watering and consider adding a small amount of organic matter to the mix if using solely Kanuma.

Pros and Cons

Pros

Excellent water and nutrient retention capacity
Good for acid-loving plant species
Medium grain size promotes drainage and aeration
Lightweight, improving pot manageability
Can be used alone or as a component in custom soil mixes
Visually appealing top dressing

Cons

Acidic PH may not be suitable for all bonsai species if used alone
May require mixing with other substrates to achieve optimal PH for certain plants
As a single component, might lack some organic matter found in broader potting mixes

Setup, Compatibility & Care

Setup:

When using Kanuma soil for the first time, it is recommended to pre-moisten it slightly to ensure even hydration. If mixing with other substrates, combine thoroughly before repotting.

Compatibility:

This soil is particularly well-suited for acid-loving plants such as Azaleas, Gardenias, Camellias, and also performs well for Junipers and Chinese Elms. For trees that prefer a more neutral or alkaline soil, it is advisable to mix Kanuma with other substrates like Akadama or pumice to adjust the overall pH.

Care:

Store Kanuma soil in a dry, cool place away from direct sunlight to maintain its properties. Ensure the bag is sealed after use to prevent moisture absorption and contamination. Regularly monitor soil moisture levels, using the color change as a guide. Water thoroughly when the soil begins to lighten in color.