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Volcanic Rock Dust Natural Fertiliser For Plants 1kg - Compost Accelerator - High In Minerals Trace Elements - Stabilise Soil pH - Increases Resistance to Drought - All Year Use - Wormeries - Seedzbox Made from basalt volcanic rock dust mined in Scotland, it is beneficial to apply all year round except when the ground has frozen or in windy conditions. Earthworm action will benefit the effects of the rock dust as they will draw the rock dust into the soil and help release the minerals. How to use – 1) TOP DRESSING - Spread at any time of year unless frozen or windy conditions. 2) PLANT POTS, TUBS AND BASKETS - Sprinkle level tablespoonful onto 15cm surface diameter of compost or soil and water - two applications per year. How to use – 1) COMPOST ACTIVATOR AND ACCELERATOR - Each time you add a new layer of compost to your compost bin or pile, simply add a light covering over the surface that you can easily see through. By using volcanic dust, it speeds up the compost break down process, reaches higher temperatures and reduces odours. 2) WORMERIES - Sprinkle small handful per 30cm² (1ft²) onto surface of your wormery every month. Try a small area with this amount and see the worms congregate. 5% of sales are donated to OneTreePlanted charity, which plants trees in over 50 countries and have planted over 40 million trees to date with a 80% survival rate. To check how many trees that Seedzbox has donated so far, please view the images section of Amazon on the product page.