Composting Guide
Turn kitchen scraps and yard waste into garden gold
Quick Reference
Why Compost Is Essential
Compost is decomposed organic matter - the single best amendment you can add to any soil. It improves every soil type and provides benefits no synthetic fertilizer can match:
- Improves structure - Loosens clay, helps sand hold water
- Feeds soil life - Beneficial bacteria, fungi, and earthworms thrive
- Provides slow-release nutrients - NPK plus micronutrients, released gradually
- Suppresses disease - Healthy soil biology outcompetes pathogens
- Recycles waste - Keeps organic matter out of landfills
The Science: Greens and Browns
Greens (Nitrogen)
Wet, fresh materials that provide nitrogen for microbes:
- • Fruit and vegetable scraps
- • Coffee grounds and tea leaves
- • Fresh grass clippings
- • Fresh plant trimmings
- • Manure (herbivore only)
Browns (Carbon)
Dry materials that provide carbon and structure:
- • Dry leaves (shredded is best)
- • Cardboard and paper (shredded)
- • Straw and hay
- • Wood chips and sawdust
- • Dried plant stalks
The golden ratio: Aim for roughly 3 parts brown to 1 part green by volume. Too much green = smelly pile. Too much brown = slow decomposition. It doesn't need to be exact - composting is forgiving.
Composting Methods
Hot CompostingFastest
Active management for fast results. Build pile at least 3x3x3 feet, maintain moisture, and turn every 1-2 weeks. Internal temperature reaches 130-160F, killing weeds and pathogens. Finished in 4-8 weeks.
Best for: Large quantities, impatient gardeners, killing weed seeds
Cold CompostingEasiest
Passive approach - just pile materials and wait. Add scraps as you have them, maybe turn once or twice a year. Takes 6-12 months but requires minimal effort. May not kill all weed seeds.
Best for: Busy gardeners, small amounts, patient folks
Tumbler CompostingConvenient
Enclosed drum you spin to turn. Great for small spaces, keeps pests out, and is easy to turn. Heats up faster than open piles. Batch composting works best - fill it, then stop adding until finished.
Best for: Urban gardens, small spaces, pest-prone areas
Vermicomposting (Worm Bin)
Red wiggler worms eat kitchen scraps and produce castings (worm poop) - the most nutrient-dense compost available. Works indoors or outdoors, compact footprint. No browns needed, just food scraps and bedding.
Best for: Apartments, year-round composting, premium compost
Step-by-Step: Building a Compost Pile
- 1Choose a location
Level spot with good drainage, partial shade is ideal. Full sun dries piles faster; full shade slows decomposition. Easy access to water source.
- 2Start with a brown base
Layer 4-6 inches of coarse brown materials like small sticks and straw. This creates airflow at the bottom and prevents matting.
- 3Alternate layers
Add 2-4 inches of green material, then 4-6 inches of brown. Repeat. Chop or shred large pieces - smaller = faster decomposition.
- 4Add water
Each layer should be moist like a wrung-out sponge. Too dry = slow decomposition. Too wet = smelly anaerobic mess.
- 5Turn regularly (for hot composting)
Every 1-2 weeks, use a pitchfork to move outer material to the center. This adds oxygen and redistributes moisture and heat.
- 6Know when it's done
Finished compost is dark brown, crumbly, and smells earthy - like forest floor. You shouldn't recognize original materials. No heat when turned.
What NOT to Compost
- • Meat, fish, bones - Attract pests, smell terrible, decompose slowly
- • Dairy products - Same issues as meat
- • Oils and fats - Create anaerobic conditions, attract animals
- • Pet waste - Contains pathogens harmful to humans
- • Diseased plants - May spread disease unless pile gets very hot
- • Weeds with seeds - Seeds may survive unless pile reaches 140F+
- • Treated wood/paper - Contains chemicals you don't want in food gardens
Troubleshooting Common Problems
Pile smells bad
Too wet or too many greens. Add browns (shredded cardboard, leaves), turn to add oxygen. Rotten egg smell = anaerobic; ammonia smell = too much nitrogen.
Pile not heating up
Needs more greens, more moisture, or larger volume. Piles under 3x3x3 feet struggle to heat. Add nitrogen-rich materials like grass clippings or coffee grounds.
Attracting pests
Bury food scraps under browns, never leave exposed. Use enclosed tumbler or bin if rodents are a problem. Avoid meat and dairy entirely.
Taking too long
Chop materials smaller, turn more often, maintain moisture. Large woody pieces can take years - remove them or chip finely. Check your green/brown ratio.
Using Compost in Your Garden
- Soil amendment: Work 2-4 inches into new garden beds. For established beds, top-dress with 1-2 inches and let worms incorporate it.
- Potting mix: Mix up to 30% compost with potting soil for containers. Don't use pure compost - it's too dense and can retain too much water.
- Seed starting: Screen compost through 1/4" mesh and mix 1:3 with perlite for seed starting. Raw compost is too strong for delicate seedlings.
- Compost tea: Steep finished compost in water for 24-48 hours with aeration. Use to water plants - provides beneficial microbes and gentle nutrition.
Frequently Asked Questions
How long does it take to make compost?
Hot composting with frequent turning can produce finished compost in 4-8 weeks. Cold composting (passive piles) takes 6-12 months. Most gardeners fall somewhere in between - turning occasionally and getting usable compost in 3-6 months.
What can I put in my compost?
Add a mix of 'greens' (nitrogen-rich: kitchen scraps, grass clippings, coffee grounds) and 'browns' (carbon-rich: dry leaves, cardboard, straw). Avoid meat, dairy, oils, pet waste, and diseased plants - these attract pests or create problems.
Why does my compost smell bad?
Smelly compost usually has too much nitrogen (greens) or is too wet and has gone anaerobic. Add dry brown materials like shredded cardboard or leaves, turn the pile to add oxygen, and ensure it's not in a low spot where water collects.
How much compost should I add to my garden?
Apply 1-3 inches of compost annually to vegetable gardens. Work it into the top 6-8 inches for new beds, or top-dress existing beds and let worms incorporate it. You can't really add too much compost - it's very forgiving.