Composting Ingredients: A Practical Guide to What Goes In

Can you compost pistachio shells? Absolutely. They are an excellent source of carbon and add important trace elements. Since they are hard and break down slowly, they also help maintain good aeration in your compost pile over time.

The simplest way to process eggshells is to crush them and add them directly to your composter. The microbial activity in the pile will break them down, making their rich calcium content available to your plants in a form they can absorb.

Eggshells and bones are great additions but take a long time to decompose in a home composter, sometimes up to a year or more. Crushing or breaking them into smaller pieces will help speed up the process. If they aren't fully broken down, just add them to the next batch.

Hard, fibrous materials like corn cobs or woody stems are perfect for the bottom layer of your composter. They break down slowly, creating stable air pockets that ensure good aeration and prevent the bottom of the pile from becoming too wet or compacted.

You should not compost glossy paper. The shiny coating often contains clay, resins, and even plastic, which are not biodegradable. The inks can also contain chemicals harmful to your soil. The best way to handle glossy paper is to send it for recycling.

You can compost butter paper, but only if it is unbleached, unwaxed, and free of any chemical or plastic coatings. Be sure to shred it into small pieces and don't add too much at once, as it can hinder aeration.

What makes compost black and rich? A diverse diet for your microbes. I always add a wide variety of kitchen scraps, including vegetable peels, fruit waste, eggshells, and even leftovers, to create a nutrient-dense final product.

In this Q&A, I confirm that you can compost items like bread, rotis, and even leftover pizza. The key is to break them into small pieces before adding them to the pile to ensure they integrate well and don't form a dense, air-blocking mass.