Where Can I Find More Browns for Compost? The Best Carbon-Rich Materials to Collect
If your compost pile is wet, smelly, or slow to decompose, you may not have enough "browns." Brown materials are carbon-rich ingredients that provide energy for the microorganisms responsible for breaking down organic matter. They also improve airflow, absorb excess moisture, and help create the balance needed for healthy compost. The good news is that browns are everywhere. From your own backyard to local businesses and community resources, there are plenty of free and inexpensive ways to keep your compost pile supplied year-round.
What Are Browns in Compost?
Browns are dry, carbon-rich materials that balance nitrogen-rich "greens" like fruit scraps, vegetable peels, coffee grounds, and grass clippings. Common browns include:
Fallen leaves
Shredded cardboard
Shredded paper
Straw
Untreated wood chips
Small twigs
Pine needles
Sawdust from untreated wood
Paper egg cartons
Brown paper bags
A healthy compost pile needs both greens and browns to support efficient decomposition.
Fallen Leaves
Leaves are one of the best and most abundant sources of browns. Collect leaves in autumn and store them in bags or bins to use throughout the year. Shredding leaves helps them decompose more quickly while reducing storage space.
Cardboard Boxes
Shipping boxes are an excellent source of carbon. Before composting:
Remove tape and staples.
Remove plastic labels.
Tear or shred the cardboard.
Moisten it before adding it to your compost pile.
Plain corrugated cardboard breaks down surprisingly well.
Paper Products
Many paper products can be composted. Avoid glossy magazines, heavily coated paper, and plastic-lined products. Good options include:
Office paper
Newspaper
Paper towels (if free of chemicals)
Brown paper bags
Junk mail without glossy coatings
Paper egg cartons
Straw
Straw provides excellent airflow while adding carbon to your compost pile. It is especially useful for balancing wet kitchen scraps and grass clippings. Choose straw rather than hay whenever possible, since hay often contains weed seeds.
Wood Chips and Arborist Mulch
Tree companies often have excess wood chips available at little or no cost. Untreated wood chips make excellent long-term carbon additions and are also valuable as mulch throughout the garden. Because wood chips contain a high amount of carbon, mix them with greener materials rather than using them alone.
Small Twigs and Branches
Small woody debris can be chipped or cut into shorter pieces before composting. Adding small branches improves airflow and creates structure within the compost pile. Avoid using pressure-treated or painted wood.
Pine Needles
Pine needles are another useful brown material. Despite common myths, composted pine needles do not permanently acidify finished compost. Mix them with other browns to create a diverse compost pile.
Untreated Sawdust and Wood Shavings
If you have access to untreated wood, sawdust and wood shavings can provide valuable carbon. Use them sparingly because they contain very high levels of carbon and can temporarily slow decomposition if added in excessive amounts. Never compost sawdust from treated, painted, or manufactured wood products.
Save Browns Throughout the Year
Many composters run out of browns because they only collect them during autumn. Instead, create a year-round supply by saving:
Cardboard from deliveries
Paper bags
Egg cartons
Toilet paper rolls
Paper towel rolls
Dry leaves
Small branches after pruning
Keeping a storage bin of dry browns makes balancing kitchen scraps much easier.
Ask Your Community
You don't always have to collect browns yourself. Excellent local sources include:
Neighbors with excess leaves
Arborists
Tree trimming companies
Coffee shops (for coffee chaff or cardboard)
Local farms with straw
Community garden cleanup days
Many businesses are happy to give away materials they would otherwise pay to dispose of.
Frequently Asked Questions
Can you have too many browns?
Yes. Excessive browns can slow decomposition because microorganisms also need nitrogen-rich greens to grow.
What happens if your compost doesn't have enough browns?
The pile may become wet, compacted, smelly, and slow to decompose because excess nitrogen creates anaerobic conditions.
Are wood chips considered browns?
Yes. Untreated wood chips are one of the highest-carbon materials commonly used in composting.
Can shredded paper replace leaves?
Yes. Shredded paper works well as a brown material, although a diversity of compost ingredients generally produces healthier finished compost.
Should I stockpile browns?
Absolutely. Many experienced composters collect leaves, cardboard, and other browns whenever they are available so they have enough throughout the year.
Brown Is the Secret Ingredient to Better Compost
A successful compost pile isn't built with kitchen scraps alone. Collecting leaves, cardboard, paper, straw, wood chips, and other carbon-rich materials throughout the year will help you create a healthier compost pile that breaks down faster, smells better, and produces richer finished compost. Building a reserve of browns is one of the simplest ways to improve your compost while turning everyday materials into healthier soil for your garden.
About Let’s Go Compost
Let’s Go Compost is a national nonprofit making composting simple, affordable, and accessible. Our programs bring hands-on composting to communities, helping people turn food and plant waste into healthy soil that supports food systems, native plant ecosystems, and pollinators. Learn more at letsgocompost.org and support our work at letsgocompost.org/donate.
