Garden, Compost and Pot Application
Gardens
Mix biochar with garden soil at a ratio of 1:30 by volume (one part biochar to 30 parts soil). Apply evenly to the top 10 cm of soil (i.e., apply about 3.3 litres of biochar for every one square meter of garden).
Compost
To enhance the quality and value of both biochar and compost, it's recommended to add biochar at a rate of 1:20 by volume (1 part biochar to 20 parts compost).
Amending gardens with compost-biochar mix
Apply your compost-biochar mix to garden soil at a 1:10 ratio by volume (one part biochar-compost mix to 10 parts garden soil). Apply evenly throughout the top 10 cm of soil. For raised pots or beds, change the ratio to 1:5 by volume. The biochar-compost mix combines the benefits of compost and biochar.
Tip for raised beds or pots
If compost isn’t available, mix biochar with nutrient rich soil at a ratio of 1:1. Let sit for 3-5 days in a damp environment. Once enriched, apply the mixture at a 1:50 ratio to raised beds or pot soil.