What to Do With Food Scraps (Instead of Throwing Them Away)

So you're standing at the counter with a pile of carrot tops, onion skins, and coffee grounds — and the trash can is right there. Before you toss them, know this: you have better options. The main ones are reuse them in cooking (vegetable stock, citrus zest, regrowing scallions), freeze them for later (a stock bag in the freezer), and compost them for your houseplants, balcony pots, or garden. Composting is the catch-all — when a scrap can't be cooked or frozen, it can almost always be composted. Here's exactly how to do each one, which scraps work best, and how to set up a system you'll actually keep using.

Why Not Just Throw Them in the Trash?

It's tempting to think a banana peel in the trash is harmless — it's food, it'll break down, right? Not the way you'd expect. When food scraps go to a landfill, they get buried under tons of other trash and rot without oxygen. That anaerobic process releases methane, a greenhouse gas roughly 28 times more potent than carbon dioxide over a 100-year period [EPA, 2024]. Food waste is the single most common material sent to U.S. landfills, making up about 24% of what gets buried there [EPA, 2023].

There's a second loss too: nutrients. Those peels and trimmings are packed with organic matter, nitrogen, and minerals that plants love. Bury them in a landfill and that value is gone forever. Compost them, and you turn them back into something that feeds soil. Throwing food scraps away isn't neutral — it's a small, daily leak of both climate impact and free fertility. For a fuller breakdown of the numbers, see our guide to the true cost of food waste.

Cook and Reuse Scraps First

The greenest scrap is the one you never throw out. A surprising amount of what we call "waste" is genuinely useful in the kitchen:

• Vegetable stock. Onion skins, carrot peels, celery ends, mushroom stems, and herb stems make excellent stock. Simmer them with water for 45 minutes, strain, and you've got a free base for soups and risotto.
• Citrus zest and peels. Zest lemons, limes, and oranges before juicing them — freeze the zest for baking. Dried citrus peels also make a fragrant addition to tea.
• Regrow from scraps. Scallions, celery bases, romaine hearts, and green onions will regrow roots in a glass of water on your windowsill. Herbs like basil and mint root easily too.
• Crispy snacks. Potato peels tossed in oil and baked become chips. Broccoli stems, peeled and sliced, are great raw or roasted.

Reusing scraps is the highest-value move because it displaces food you'd otherwise buy. But not everything is edible or worth cooking — and that's where the next two options come in.

Freeze Scraps for Later

Maybe you don't have time to make stock tonight. That's fine — freeze the scraps and do it when you're ready. Keep a gallon zip-top bag or lidded container in your freezer and add vegetable trimmings as you cook: onion ends, carrot peels, leek tops, parsley stems, corn cobs. When the bag is full, dump it straight into a pot for stock. No spoilage, no smell, no rush.

The freezer trick works for more than stock. Overripe bananas freeze perfectly for banana bread. Herb leaves can be chopped into an ice-cube tray with olive oil for instant flavor bombs. Freezing basically buys you time — it turns "I should do something with this" into "I'll do it when it's convenient." Anything you can't cook or freeze, though, still has a home: the compost.

Compost Them — The Catch-All

Here's the option that handles almost everything else: composting. Coffee grounds, eggshells, wilted greens, apple cores, corn husks, the pulp from your juicer — all of it can become compost, which is decomposed organic matter that feeds soil and plants. Composting is the catch-all because it doesn't require the scrap to be edible or freezer-friendly. If it grew from the ground, it can usually go back to it.

You have three main routes:

• Backyard composting. A pile or bin outdoors where scraps and yard waste ("browns" like leaves and cardboard, "greens" like food scraps) break down over months. Cheap and effective if you have outdoor space. Learn the basics in our guide to making compost at home.
• Worm composting (vermicomposting). A contained bin where red wiggler worms eat your scraps and produce rich castings. Great for small spaces and works indoors.
• Electric composters. Countertop machines that process scraps quickly. This is where it gets important to read the fine print: many electric units simply dry and grind food into a dehydrated crumble. That material is a useful soil amendment, but it isn't finished compost — it hasn't been broken down by microbes.

This is where Reencle is different. Instead of dehydrating, it uses live microbes to break scraps down into real, living compost — dark, crumbly, and biologically active — that needs only a short curing period before you use it on plants. It sits on your counter, runs quietly, stays odor-free thanks to a sealed chamber and carbon filter, and needs no yard at all. For apartment dwellers who want genuine compost rather than dried scraps, it closes the gap between "I care about this" and "I don't have the space." The Reencle Prime is $549.

Which Scraps Compost Well vs. Which Don't

Not every scrap belongs in a compost bin. As a rule, plant-based kitchen waste is welcome; meat, dairy, and oily foods cause odor and pests in a home pile [EPA, 2024]. Here's a quick reference:

For a deeper list of what belongs in your bin and what to avoid, see our full guide to what you can compost.

No Garden? Here's What to Do With the Compost

A common worry: "If I compost, what do I even do with it?" You don't need a vegetable plot to put compost to work. A few ideas:

• Houseplants. Mix a spoonful of cured compost into the top inch of potting soil for a slow, gentle nutrient boost.
• Balcony and patio pots. Herbs, tomatoes, and flowers in containers thrive with compost worked into the mix each season.
• Give it away. Neighbors who garden, a friend with a yard, or a local community garden will happily take finished compost.
• Community drop-off. Many cities now run curbside organics collection or accept scraps at farmers' markets and drop-off sites. Check your municipality's website — this is the easiest zero-effort option if you'd rather not process scraps yourself at all.

A Simple System That Actually Works

You don't need to do all of this. Pick a routine you'll keep:

1. Keep a stock bag in the freezer. Toss in usable vegetable trimmings as you cook.
2. Set a small counter bin for the rest. Everything compostable that isn't stock-worthy goes here.
3. Process weekly. Empty the counter bin into your composter, backyard pile, worm bin, or community drop-off.
4. Use or share what you make. Feed houseplants and pots, or hand off the surplus.

That's it — a two-container habit that keeps most of your food scraps out of the landfill with about five extra seconds per meal.

Frequently Asked Questions

What can I do with food scraps if I live in an apartment? Keep a freezer stock bag for vegetable trimmings, and compost the rest with a countertop worm bin or an electric composter like Reencle that needs no yard. Many cities also offer organics drop-off or curbside collection.

Are food scraps bad for the environment in the trash? Yes. In landfills, food scraps rot without oxygen and release methane, a greenhouse gas far more potent than CO2 [EPA, 2024]. Composting avoids this and returns nutrients to soil.

Can I compost cooked food and leftovers? Plant-based leftovers like rice, pasta, and bread can be composted sparingly, but meat, dairy, and oily foods attract pests and cause odor in home systems [USDA, 2023]. Freeze meat scraps for stock instead.

Do I need a garden to make composting worth it? No. Compost is useful for houseplants, balcony pots, and container gardens, and you can always give the surplus to neighbors or a community garden.

What's the difference between a food scrap dryer and a real composter? Dehydrator-style machines dry and grind scraps into a crumble that isn't finished compost. Reencle uses live microbes to make real, living compost that needs only a short curing period before use.

References

1. U.S. Environmental Protection Agency. (2024). Composting at Home. https://www.epa.gov/recycle/composting-home
2. U.S. Environmental Protection Agency. (2023). 2019 Wasted Food Report: Estimates of Generation and Management of Wasted Food in the United States. https://www.epa.gov/sustainable-management-food
3. U.S. Environmental Protection Agency. (2024). Basic Information about Landfill Gas. https://www.epa.gov/lmop/basic-information-about-landfill-gas
4. U.S. Department of Agriculture. (2023). Composting. https://www.usda.gov/composting