{"product_id":"biochar-granules-0-13mm","title":"Soil Fixer Biochar Granules (0-13mm)","description":"\u003cp\u003eApprox. 20% \u0026lt;2 mm\u003c\/p\u003e\n\u003cp\u003eApprox. 50% 2–8 mm\u003c\/p\u003e\n\u003cp\u003eApprox. 30% 8–13 mm\u003c\/p\u003e\n\u003cp\u003eTrommel sieves may allow a few long, thin bits to pass, so some particles may slightly exceed 13 mm.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eWe do not recommend using fine biochar powder (amorphous biochar) because it lacks the macro-pores needed by soil microbes. We also advise against using very large granules (\u0026gt;13 mm), as they offer low pore surface area and can negatively affect soil aggregation (tilth).\u003c\/p\u003e\n\u003cp\u003eRead more in our biochar blog.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eHow Much Biochar Should I Apply?\u003c\/p\u003e\n\u003cp\u003eApply 1 kg per square metre (1 kg\/m²)\u003c\/p\u003e\n\u003cp\u003eThis is roughly equal to 5% by volume, although it depends on soil depth.\u003c\/p\u003e\n\u003cp\u003eFor more information on how to calculate by area, volume or weight – and how to stretch your biochar budget – see our application ratio blog.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eVolumes and Weights\u003c\/p\u003e\n\u003cp\u003eBiochar naturally absorbs water, and moisture content varies with the seasons. That’s why we sell by volume (litres) and provide an approximate weight.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e20 litres ≈ 10 kg\u003c\/p\u003e\n\u003cp\u003e40 litres ≈ 20 kg\u003c\/p\u003e\n\u003cp\u003eOur product contains approximately 40% water by weight.\u003c\/p\u003e\n\u003cp\u003eIf comparing prices across suppliers, make sure you’re comparing volume (litres) or adjusting prices to reflect £\/kg of dry biochar.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eFAQs\u003c\/p\u003e\n\u003cp\u003eIs biochar safe for vegetables and edible plants? Yes. SoilFixer biochar is Soil Association approved and European Biochar Certificate certified, making it completely safe for vegetable gardens and edible crops.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eHow long does biochar last in the soil? Biochar is extremely stable and can last hundreds to thousands of years in soil. It’s a permanent soil improvement, not a short-term fertiliser.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eWhen is the best time to apply biochar granules? Biochar can be applied at any time of year. Autumn and spring are ideal — autumn allows it to settle over winter, spring gives immediate benefit for the growing season.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eWhat is the difference between 0-8mm and 0-13mm granules? The 0-13mm coarse grade is ideal for borders, trees, shrubs and larger garden beds. For pots, seed beds and lawns, use the 0-8mm fine grade instead.\u003c\/p\u003e\n\u003cp\u003eAll bags have been decanted from bulk bags into clear\/plain plastic bags.\u003c\/p\u003e","brand":"Black Flag Horticulture","offers":[{"title":"0.5 Litres","offer_id":54331749761370,"sku":"BC-COARSE-500ML","price":4.95,"currency_code":"GBP","in_stock":true},{"title":"20 Litres","offer_id":54331749794138,"sku":"BC-COARSE-10KG","price":19.99,"currency_code":"GBP","in_stock":true},{"title":"40 Litres","offer_id":54331749826906,"sku":"BC-COARSE-40KG","price":36.45,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/9861\/4106\/files\/rn-image_picker_lib_temp_44387d36-eea0-4003-a565-d204540de19e.png?v=1781823362","url":"https:\/\/blackflaghorticulture.com\/products\/biochar-granules-0-13mm","provider":"Black Flag Horticulture","version":"1.0","type":"link"}