Description
Coarse horticultural vermiculite is a lightweight mineral additive that supports water retention while keeping growing media aerated. Its porous structure helps maintain balanced moisture levels and improves conditions for root development in pots, beds and seed trays.
Vermiculite water retention for balanced moisture
The mineral holds several times its weight in water, releasing it gradually into the surrounding compost. This helps maintain consistent hydration, especially in containers and propagation setups.
Aerated soil structure using coarse vermiculite
The larger particle size creates air spaces within the mix, helping prevent compaction. This allows roots to access oxygen more easily and supports steady establishment after planting.
Available vermiculite sizes
1, 2 or 5 litres
Benefits of vermiculite for growing media
- Supports steady moisture levels
- Improves airflow in soil mixes
- Helps reduce compaction
- Suitable for seed starting and potting mixes
- Lightweight addition to containers and beds
Specification
Coarse grade 3 to 6 mm mineral
Blend into compost at approximately 25 to 50 percent
Suitable for indoor and outdoor planting
Neutral mineral that does not alter soil balance
Frequently Asked Questions
Can vermiculite be used on its own for propagation?
Yes, it can be used alone for rooting cuttings or seed germination where consistent moisture is required.
Is it suitable for hanging baskets?
It helps reduce drying out in baskets by holding moisture within the compost for longer periods.
Will it break down over time?
The structure remains stable in soil mixes, maintaining texture across multiple growing cycles.
Can it be mixed with other soil additives?
It is often combined with materials such as grit or perlite to tailor drainage and moisture levels.
Is it useful for transplanting?
Adding it to planting mixes can help reduce stress by keeping moisture levels more consistent around new roots.