Soil Layer

Our Soil Layer selection includes the essential materials needed to build a healthy base for your terrarium. From activated charcoal to premium potting mixes, these components help regulate moisture and support plant growth.

You can also browse our full range of soil and mixes for houseplants and other greenery.

  • Activated Charcoal For Plants Terrariums 100g

    Activated Charcoal For Plants Terrariums 100g

    £6.00

    Activated charcoal (charcoal heated to increase its adsorptive power) is a great house plant soil amendment that can help improve your plants health.

    • perfect to add as a layer for your open or closed terrarium
    • helps prevent mould and bacteria growth
    • improve water circulation and prevent overwatering

    Mix the charcoal with soil or add a layer on the bottom to improve drainage, absorb odours, and toxins and prevent moulds as well as balance/lower pH.

    It is an excellent absorbent which can absorb fertilizer and release slowly for a longer period providing a healthy dose on a regular basis.

    Perfect for mossariums and terrariums too!

    100g paper zip bag or plastic container

  • Terrarium and Mossarium Potting Mix Soil by Highland Moss 700g

    Terrarium, Vivarium and Mossarium Potting Mix Soil by Highland Moss

    From: £4.00

    Terrarium Potting Mix for Moss, Terrariums & Vivariums

    Our terrarium potting mix is specially designed for moss, terrariums and vivariums, providing the perfect balance of moisture retention and drainage. Handmade by Highland Moss, this blend supports healthy root growth and helps create long-lasting, stable environments for your plants.

    Developed and used in our own workshops, this mix is ideal for humidity-loving plants and closed terrarium setups where standard compost would not perform well.

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Soil Layer – Creating the Perfect Base for Your Terrarium

The soil layer is the heart of any terrarium, providing essential nutrients and structure for your plants to grow and thrive. It sits above the drainage layer and supports root development, water retention, and airflow.

The soil layer works best when paired with a layer of activated charcoal, which helps filter excess moisture and keep the environment fresh. Adding activated charcoal between the drainage and soil layers supports healthy roots by reducing mould, bacteria, and odours.

In addition to function, the soil layer plays a visual role in your terrarium’s overall look. Layering it carefully can add depth and contrast, especially when paired with decorative elements like rocks or moss.

For product recommendations and layering ideas, visit our collection of terrarium drainage essentials.

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Anne
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