Biochar is an ancient technique thatâ€™s now all the rage among growers both large and small. A charcoal made by slow-heating dead plants, â€œBiochar does not bring fertilizer or water to plants, but its highly porous nature tends to increase soil resilience to water and nutrient stresses, improving overall plant nutrition,â€? explains Caroline Masiello, PhD, a soil chemistry researcher at Rice University in Houston. You can buy bags of biochar alone or mixed with compost; whichever you choose, check that the supplier is a member of the International Biochar Initiative, which sets quality and environmental standards.
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