Kanuma

Kanuma and Akadama are both popular soil amendments used in bonsai cultivation, but they have distinct properties and are suited for different types of plants. Here's a detailed comparison and information on how to use Kanuma for bonsai and other plants:

Kanuma

Composition:

• Kanuma is a type of volcanic soil that is highly acidic, with a pH typically ranging from 4.5 to 5.5.
• It is lightweight and has excellent water retention and drainage properties.

Suitable Plants:

• Kanuma is particularly well-suited for acid-loving plants such as azaleas, camellias, and rhododendrons.
• It is also used for other bonsai species that prefer slightly acidic soil conditions.

Usage:

1. Preparation: Before using Kanuma, it is often recommended to sift it to remove fine particles and dust. This helps improve aeration and drainage.
2. Mixing: Kanuma can be used alone or mixed with other soil components like Akadama, pumice, or lava rock to create a custom soil mix. A common mix for azaleas might be 70% Kanuma and 30% Akadama.
3. Potting: When potting or repotting, ensure that the Kanuma is evenly distributed around the roots. Gently tap the pot to settle the soil without compacting it too much.
4. Watering: Kanuma retains water well, so be mindful not to overwater. Allow the top layer of soil to dry out slightly between waterings.

Akadama

Composition:

• Akadama is a hard-baked Japanese clay that is neutral to slightly acidic, with a pH typically ranging from 6.0 to 6.5.
• It is heavier than Kanuma and has good water retention and drainage properties, but it tends to break down over time.

Suitable Plants:

• Akadama is versatile and can be used for a wide range of bonsai species, including pines, maples, and junipers.
• It is particularly favored for its ability to provide a stable environment for root growth.

Usage:

1. Preparation: Like Kanuma, Akadama should be sifted before use to remove fine particles.
2. Mixing: Akadama is often mixed with other components like pumice and lava rock to create a well-draining soil mix. A common mix might be 50% Akadama, 25% pumice, and 25% lava rock.
3. Potting: When potting or repotting, ensure that the Akadama is evenly distributed around the roots. Gently tap the pot to settle the soil.
4. Watering: Akadama retains water well but also drains efficiently, so it requires regular watering. Monitor the soil moisture closely.

Key Differences

1. pH Level:
2. Weight:
3. Durability:
4. Water Retention:

Conclusion

Choosing between Kanuma and Akadama depends on the specific needs of your bonsai or other plants. Kanuma is the go-to for acid-loving species, while Akadama offers versatility for a wider range of plants. Both can be used alone or in combination with other soil components to create the ideal growing medium for your bonsai.