Biochar for Lawns & Turf
A fine-grade biochar top-dressing, raked in after core aeration, integrates pore space into compacted turf profiles.
Last updated April 18, 2026
The lawn application
Turf compacts under foot traffic and mower weight. Core aeration breaks the compaction mechanically — biochar fills the cores with a carbon scaffolding that keeps the pore space open through the season.
Workflow
- Core-aerate first. A rental aerator or pro service is easier than hand tools at lawn scale.
- Broadcast biochar. ~0.25 kg/m² (about 2.5 kg per 10 m², or 1 kg per 4 m²).
- Rake lightly. Work the biochar into the aeration cores. Do not bury it under a heavy topdressing.
- Water in. Soaking immediately prevents dust and starts the biochar holding moisture in the cores.
- Optional second pass: a follow-up aeration + biochar cycle in the opposite season compounds results.
Timing
- Ontario: Early fall (after Labour Day) is ideal — cooler temperatures and steady rain. Spring also works; aim for just before lawn growth peaks.
Coverage
| Lawn area | Biochar needed | Bags |
|---|---|---|
| 50 m² (small front lawn) | ~12.5 kg | nine 6.5 L bags |
| 100 m² (typical back lawn) | ~25 kg | seventeen bags — ask about wholesale |
| 250 m²+ | Bulk order | See wholesale inquiries |
A note on expectations
Turf top-dressing is a slow, cumulative practice. First-year results are subtle; the second and third aeration+biochar cycles are where the compaction and moisture profile change visibly. This is not a weekend green-up — it is a multi-year structural upgrade.