Information on this site is for general reference only. Local municipal composting regulations may vary by province and municipality.

Backyard Composting & Soil Enrichment

Turn kitchen scraps and yard waste into richer garden soil

Practical notes on composting methods, seasonal adjustments for Canadian climates, and applying finished compost to improve soil structure and fertility.

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Recent Articles

A reference on composting practices suited to Canadian growing conditions, from first setup through finished soil amendment.

A plastic backyard compost bin in a garden

Setup & Equipment

How to Set Up a Backyard Compost Bin

Choosing a bin type, selecting the right location, and layering materials correctly for consistent decomposition.

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Finished compost material

Seasonal Management

Managing Organic Waste Through the Canadian Seasons

How composting timelines and moisture management shift from spring thaw through winter dormancy in Canada.

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Earthworms in rich garden soil

Soil Quality

Improving Garden Soil with Finished Compost

Application rates, timing, and what to expect when integrating mature compost into different soil types.

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Key Concepts

Composting fundamentals

Core ideas that apply across composting methods and Canadian growing regions.

Carbon to Nitrogen

The C:N Ratio

Maintaining a carbon-to-nitrogen ratio of roughly 25–30:1 by volume is the primary lever controlling how quickly organic material breaks down. Browns (dried leaves, straw, cardboard) supply carbon; greens (food scraps, fresh grass) supply nitrogen.

Moisture

Pile Moisture

A compost pile should feel roughly like a wrung-out sponge — damp but not dripping. In drier Canadian summers, covering the pile or adding water occasionally prevents stalling. In wet springs, adding extra carbon materials absorbs excess moisture.

Aeration

Turning and Airflow

Decomposition is aerobic — oxygen is required. Turning the pile every two to four weeks reintroduces oxygen and redistributes heat. Piles left unturned for months will still decompose, but more slowly and less evenly.

Temperature

Heat in the Pile

Active compost piles can reach 55–65°C in the core during peak decomposition. This temperature range helps break down weed seeds and some plant pathogens. Piles that never heat up are still decomposing, though more slowly.

Particle Size

Shredding and Chopping

Smaller pieces decompose faster because microorganisms have more surface area to work with. Shredding leaves, chopping kitchen scraps, and breaking down cardboard into pieces under 5 cm noticeably shortens decomposition time.

Maturity

Knowing When It Is Ready

Finished compost is dark brown, crumbles easily, smells earthy rather than sharp, and no longer generates heat when turned. Original materials should no longer be recognizable. Immature compost applied directly to soil can temporarily tie up nitrogen.

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