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Coarse Vermiculite

SKU: VER1
£699
Tax included, shipping and discounts calculated at checkout.

Coarse Horticultural vermiculite 3-6mm is a natural soil additive designed to improve soil structure for seed starting, plant growth and indoor or outdoor gardening. This lightweight mineral helps maintain moisture and supports root development by improving aeration and nutrient absorption. It is easy to mix into potting soil for stronger plants.

Why Choose Horticultural Vermiculite For Soil And Plants?

Vermiculite for plants helps regulate water absorption by holding three to four times its weight in moisture. By adding it to soil, you create better conditions for root growth while reducing the risk of soil compaction. Gardeners use vermiculite to give seedlings and young plants a strong start.

How To Use Horticultural Vermiculite In Gardening And Seed Starting

To use vermiculite, simply mix it into your potting soil at a ratio of around 25 to 50 percent, depending on how much water retention your plants need. It is especially effective for seed starting, transplanting, and houseplants prone to dry soil.

Horticultural Vermiculite For Plants And Soil

Vermiculite for gardening is a lightweight mineral that expands when heated, creating a porous structure that improves soil aeration. By using horticultural vermiculite in potting soil, your plants benefit from better water retention and stronger root systems.

Vermiculite For Seed Starting And Root Development

Seedlings thrive in soil containing vermiculite because it balances moisture while preventing soil from becoming too dense. When mixed into compost or potting soil, it allows seeds to germinate more effectively and helps transplants establish quickly.

Vermiculite For Indoor And Outdoor Gardening

Horticultural vermiculite can be used for indoor houseplants, hanging baskets, raised beds and outdoor borders. Its ability to retain moisture while maintaining aeration makes it an essential soil additive for gardeners wanting healthier plants.

Specificaitons

Sizes available: 1L,2L,5L

Advantages of  Coarse (3–6 mm) Vermiculite 

  1. Better Aeration – The larger particle size creates bigger air gaps in the growing medium, reducing compaction and improving root oxygenation. 

  1. Improved Drainage – Water drains more freely through coarse vermiculite than finer grades, making it suitable for plants that dislike water logging. 

  1. Lightweight Bulking Agent – Adds volume without weight, ideal for soil mixes and large planters where you want to reduce density. 

  1. Good Water-Holding with Balance – Still retains moisture within its layered structure, but not as much as fine grades – giving a balance of moisture retention and drainage. 

  1. Longevity – Larger granules break down more slowly than fine vermiculite, so they maintain structure longer in soil mixes. 

  1. Root Establishment – Coarse structure helps young roots anchor more securely and encourages stronger root branching. 

  1. Ideal for Propagation of Woody Cuttings – Provides the aeration and moisture balance needed for rooting cuttings of shrubs, trees, and houseplants. 

Need more information on vermiculite and how to use it?  See the difference between vermiculite and perlite.

FAQs

Can vermiculite be mixed with compost?

Yes, vermiculite blends well with compost, improving texture and water retention for a healthier growing medium.

Is vermiculite safe to use with edible plants like vegetables and herbs?

Yes, vermiculite is a natural mineral and is safe for use with vegetables, herbs and other edible plants.

Can I use vermiculite instead of perlite in soil mixes?

Yes, vermiculite can replace perlite, but it retains more water, making it better for moisture-loving plants.

Does vermiculite change soil pH?

No, vermiculite is pH neutral and will not alter the natural balance of your soil.

How should vermiculite be stored when not in use?

Store vermiculite in a dry place in its original bag or a sealed container to keep it free from moisture before use.

Can vermiculite help reduce the frequency of watering plants?

Yes, because vermiculite holds several times its weight in water, it reduces how often you need to water.

What is the difference between vermiculite and perlite

  • Vermiculite: Absorbs 3–4 times its weight in water, helping soil stay moist. Best for seed starting, houseplants and plants that like consistent moisture.

  • Perlite: Does not absorb water but improves drainage and airflow. Best for succulents, cacti and plants that prefer drier soil.

They are often mixed together to balance moisture retention and aeration.

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