Carbon Gold Tree Fertiliser Feed trees, shrubs and woody plants with this unique vitality booster. Tree Fertiliser blends enriched biochar with potassium phosphite to grow healthier, more vigorous plants in the harshest conditions. Carbon Gold Tree Fertiliser contains Potassium phosphate which delivers essential nutrients for tree health, mycorrhizal fungi maximises nutrients & water uptake, the seaweed provides essential minerals and trace elements, and the organic wormcasts are full of beneficial bacteria crucial to healthy root systems.