Everyday composting
Greens and browns: finding your compost balance
Keep a basket of dry leaves or plain cardboard next to your bin. It is one of the simplest ways to make your next batch of kitchen scraps easier to manage.
The names describe their role, not just their color
Greens are nitrogen-rich ingredients; browns provide carbon. Coffee grounds belong with greens even though they look brown. Dry leaves and woody plant material belong with browns.
The Oregon DEQ guide groups ingredients by their role in a compost recipe. Use the examples below to sort a typical household batch.
| Greens | Browns |
|---|---|
| Fruit and vegetable trimmings | Dry leaves |
| Coffee grounds | Small woody prunings |
| Fresh grass clippings | Shredded plain cardboard |
Start with two to three parts browns
For each container of fresh scraps, start with roughly two to three containers of browns by volume. The EPA recommends this starting proportion. Mix the ingredients and cover food scraps with dry material.
This is a practical volume guide, not a laboratory carbon-to-nitrogen measurement. Different materials behave differently. A bucket of loose leaves and a tightly packed bucket of cardboard are not identical ingredients, so watch the pile and adjust.
Balance moisture as well as ingredients
Your pile needs moisture without becoming waterlogged. University of Maryland Extension recommends a damp, squeezed-sponge texture. If the material is soggy, add absorbent browns and improve airflow. If it is very dry, introduce water gradually while mixing.
Do not turn the ratio into a rigid rule. Look at the material inside the bin before adding water, especially after a rainy week. Break up dense clumps rather than leaving them as a solid layer.
Build a habit around what you already have
Before taking scraps outside, check that your browns container is stocked. Keep cardboard dry, prepare it in small batches, and set aside seasonal leaves when they are available. Put both containers where you can reach them without reorganizing the garden.
A simple note such as “more leaves this week” is enough to track your changes. If the pile develops an unpleasant smell, use our compost odor troubleshooting guide to decide what to check next.
Written for ordinary outdoor home composting. Ingredient guidance and timing can vary with your climate and setup; linked public resources provide further detail.