Vermiculite Compost Additive - 20Ltr Bag

Achieve better results with your sowing, potting and propagation projects using this generous 20 litre bag of Vermiculite. This lightweight, mineral-based growing aid is widely valued for its excellent moisture-retaining properties and its ability to create an airy, free-draining growing medium that supports healthy root systems.

When incorporated into compost, vermiculite improves structure by keeping the mix loose and well aerated. This creates ideal conditions for root development in seedlings, houseplants and container-grown plants. Its ability to hold moisture while still maintaining drainage makes it especially useful for young plants and seeds, which require consistent but gentle hydration.

As a top layer over seed trays, vermiculite helps maintain even moisture levels and protects germinating seeds from abrupt drying or disturbance. Its sterile, inert nature gives seedlings a clean start free from pests and diseases — a crucial benefit when growing delicate or high-value plants.

For houseplants and larger container plants, vermiculite helps prevent compaction and encourages healthier root spread, making watering easier to manage and reducing the risk of overwatering. It is equally useful for cuttings, offering a balanced environment that promotes root formation.

The 20 litre bag provides ample material for regular potting, repotting and propagation work, making it ideal for gardeners with greenhouses, allotments or extensive indoor plant collections. Whether you are preparing seed trays, improving potting mixes or supporting houseplant care, this vermiculite offers dependable performance and excellent value.