Best Materials for BioChar Production
Learn which feedstocks produce the best biochar — from hardwood to coconut shells.
Hardwood Feedstock (Best Overall)
Hardwoods like oak, maple, hickory, and beech produce the highest-quality biochar with excellent porosity and long-lasting carbon stability. They yield about 20-30% char by weight.
Oak
High density, slow-burning. Produces dense, durable charcoal ideal for soil amendment.
Maple
Moderate density, burns evenly. Good all-purpose feedstock for home production.
Hickory
Very dense, slow pyrolysis yields high-quality char with excellent pore structure.
Softwood Feedstock
Pine, fir, and spruce produce biochar faster but with lower density. They yield more volatile compounds during pyrolysis, which can be beneficial for certain soil applications.
Agricultural Waste
- Rice husks — high silica content, excellent for alkaline soils
- Corn stalks — fast pyrolysis, good for quick soil amendment
- Wheat straw — moderate yield, easy to source in bulk
- Sugarcane bagasse — abundant waste product with good porosity
Specialty Feedstocks
- Coconut shells: Produces the most porous biochar, excellent for water retention in sandy soils.
- Bamboo: Fast-growing, produces lightweight char with high surface area.
- Dried manure (herbivore): Adds nutrients during pyrolysis, producing nutrient-rich biochar.
Materials to Avoid
- Treated or painted wood — releases toxic chemicals during pyrolysis
- Plastic-contaminated waste — produces harmful dioxins
- Green/wet wood — requires excessive energy to dry before pyrolysis
Rule of thumb: Use only clean, dry, untreated organic material. Moisture content should be below 10% for best results.