Why Composting Makes Sense in Canada
Canada's federal government has set national waste diversion targets, and organic waste diversion is a core piece of reaching them. Many provinces and municipalities now run green bin programs, but those programs have limits — some accept only certain materials, and apartment dwellers often have no access at all. Home composting fills that gap.
Beyond diversion, finished compost improves soil structure, reduces the need for chemical fertilizers in gardens, and can meaningfully reduce the weight of your weekly garbage output. A household of four composting kitchen scraps typically diverts 100–150 kg of organic material per year.
Choosing the Right Composting Method
The right approach depends on how much outdoor space you have, your climate zone, and what you're composting.
Backyard Bin Composting
The most straightforward option for homeowners with outdoor space. A black plastic compost bin (available through many municipalities at subsidized prices) retains heat reasonably well and requires minimal maintenance. You layer green materials (food scraps, fresh grass clippings) with brown materials (dry leaves, cardboard, paper) and turn the pile periodically.
In Canadian winters, decomposition slows significantly but does not stop. Many composters keep adding material through winter and find an active pile again in spring. The cold-climate trick is to build a larger pile — above 1 cubic metre — which retains enough heat to keep microbial activity going even at -10°C.
Open Pile Composting
More suitable for rural properties or large yards. An open pile or a three-bin system allows larger volumes and faster decomposition when managed actively (turning every 3–5 days). This method can produce finished compost in 6–8 weeks during warm months.
Bokashi System
Bokashi uses a fermentation process rather than aerobic decomposition. You add food scraps to a sealed bucket with a bran inoculant; the material ferments over 2–4 weeks, then gets buried in soil or added to an outdoor bin. Bokashi handles meat, dairy, and cooked foods that most traditional compost systems cannot. It works well in apartments — the sealed bucket produces no noticeable odour when managed correctly.
Indoor Bin Composting
A small enclosed bin kept in a kitchen or utility area can handle fruit and vegetable scraps. This requires more careful management of moisture levels and turning frequency to avoid odour. Carbon-to-nitrogen ratio matters more here than in outdoor systems.
What Goes In — and What Doesn't
The core rule is balancing greens (nitrogen-rich, wet) with browns (carbon-rich, dry) at roughly a 3:1 ratio by volume of browns to greens.
Add these
- Fruit and vegetable scraps
- Coffee grounds and paper filters
- Tea bags (remove staples)
- Crushed eggshells
- Dry leaves, straw, and wood chips
- Cardboard and newspaper (shredded, uncoated)
- Grass clippings (in thin layers)
- Hair, nail clippings
Avoid these in a standard bin
- Meat, fish, and bones (attract pests)
- Dairy products
- Cooked food with oil or sauces
- Diseased plant material
- Dog or cat feces
- Glossy or coated paper
- Coal or charcoal ash
Setting Up Your First Bin
Choose a spot with partial shade — full sun dries out the pile too fast, and full shade slows decomposition. The bin should sit on bare soil or grass so worms and other organisms can migrate up into the pile.
Start with a layer of coarse browns (sticks, wood chips) at the bottom — about 10–15 cm. This improves drainage and airflow. Add your first batch of kitchen scraps, then cover with a 5 cm layer of dry leaves or shredded cardboard. Maintain this alternating pattern as you add material.
Moisture should feel like a wrung-out sponge — damp but not dripping. If the pile smells like ammonia, it needs more brown material or air. If it's not decomposing, it likely needs more moisture or green material.
Municipal Programs and Subsidies
Most Canadian municipalities offer composting support in some form. Toronto's backyard composting program sells bins at reduced cost. Vancouver offers similar subsidies through Metro Vancouver. In many Ontario municipalities, Ontario's Resource Productivity and Recovery Authority (RPRA) oversees diversion targets that incentivize these programs.
Before purchasing a bin at retail price, check your municipality's website for subsidized options — discounts of 50–75% are common.
What to Expect: Timeline
A backyard bin composting passively (no turning) typically produces usable compost in 6–12 months. Active management — turning every 2 weeks, maintaining moisture, keeping the ratio balanced — can reduce that to 3–4 months in warm weather. In cooler climates, budget for a full year if the bin spends several months frozen.
Finished compost looks like dark, crumbly soil and smells like earth. If you can still identify the original materials, it needs more time. Screen the finished compost through a 1 cm mesh to remove any large unfinished pieces, which go back into the active pile.
Common Issues
Unpleasant smell: Usually too many greens or insufficient aeration. Add dry browns and turn the pile. Avoid adding meat or dairy.
Pest attraction: Bury food scraps in the centre of the pile rather than laying them on top. A bin with a tight-fitting lid and no gaps at the base prevents most rodent access.
No decomposition: The pile may be too dry, lacking nitrogen, or too cold. In winter, insulating the bin with straw bales on three sides helps retain heat.
Fruit flies: Cover food scraps with a layer of browns immediately after adding them. A thin layer of finished compost on top suppresses flies effectively.
Using Finished Compost
Finished compost improves soil in vegetable gardens, flowerbeds, and around trees. Work it into the top 10–15 cm of soil before planting, or use it as a mulch layer around established plants. For container plants, a mix of one part compost to three parts potting soil provides good nutrition without overwhelming roots.
Do not apply fresh compost (material still actively decomposing) directly to plant roots — it can burn plants as it continues to generate heat. When in doubt, let it age another month.