Granular Activated Charcoal provides many benefits when mixed through potting soil or used in terrariums. It rids the soil of toxins and impurities, prevents mould and odours and repels bugs. It is can even be helpful to reduce impacts of harsh town-supplied water (which can cause brown tips on sensitive plants).
We have noticed the benefits of using activated charcoal on our own plants and use it as an ingredient in our Tropical Potting Mix, part of our Nurture Pot Packs.
Recommended ratio: Use approx. 1/2 part activated charcoal to 10 parts potting mix. A little goes a long way!