Sinclair is one of the UK's leading manufacturers and suppliers of professional growing media, horticultural additives and specialist substrates. Trusted by commercial growers, landscapers and gardeners nationwide, Sinclair products are developed to deliver consistent performance, healthy plant growth and outstanding cultivation results.

What is horticultural vermiculite used for?

Vermiculite is used to improve moisture retention, nutrient retention, aeration and root development in seed composts, potting mixes and garden soils.

Can I use vermiculite for seed sowing?

Yes, vermiculite is widely used for seed sowing because it helps maintain moisture around seeds while providing good aeration.

Is this suitable for propagation?

Yes, the medium-grade 2-5mm vermiculite is ideal for rooting cuttings and supporting healthy root development.

Can vermiculite be mixed with compost?

Yes, vermiculite can be mixed with compost and potting media to improve moisture management and soil structure.

Which plants benefit from vermiculite?

Moisture-loving plants such as hostas, astilbes, arum lilies and rudbeckia can particularly benefit from vermiculite's water-retention properties.

What size is this vermiculite?

This product contains medium-grade horticultural vermiculite with a particle size of 2mm-5mm.