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A Beginner’s Guide To Indoor Composting

12 · Jun 13, 2019 · Lisa Veronese · Leave a Comment

Composting is the controlled process of decomposing organic matter into a nutrient-dense material that can be used to enrich new plant life. Not only does it help you to save money that you might otherwise spend on chemical fertilizers, compost helps your soil to retain moisture so there’s less watering needed, and it helps to reduce the overall burden on landfill (nearly half of all landfill is organic/compostable material which, when left to inorganically break down in garbage piles, increases harmful greenhouse gas emissions.)

If you’re sold on the idea of zero waste living but lack the space to build your own garden compost pile, you’re in luck—indoor composting is simple! Here’s what you need to know to get started.

Indoor Composting 101

A beginner's guide to indoor composting

How to make your own compost bin

You can head to your local hardware store and pick up a bin that’s been specially designed for the purpose of indoor composting, or you can follow our guide below and make your own.

Pick up a plastic bin with a tight-fitting lid (one to two people could use a 10-gallon bin, but a family of four would likely need a 20-gallon container). Find a plastic tray (needs to be slightly larger, like a washing machine drain pan) to place beneath the bin in the event of leaks.

Drill a grid of small holes on the top of the lid. A healthy compost needs plenty of oxygen in order to decompose properly.

To reduce the chances of your compost becoming a fruit fly feast, use a glue gun and attach a cut-to-measure mesh or screen to the inside of the lid.

Begin your new compost project with some damp, shredded paper/cardboard, and a cup of soil. Compost bins need a mix of “brown” materials such as shredded paper, dry leaves, straw and wood chips which are high in carbon, and nitrogen rich “green” materials such as food scraps, plant cuttings, and cut grass.

A healthy compost bin will have an optimal ratio of 2:1, green to brown. Brown materials take longer to break down than green.

Keep a small hand trowel or hard garden rake nearby to use when your compost needs mixing.

Indoor composting 101Find a place in your kitchen to keep your bin (such as beneath your sink, or tucked in an out-of-the-way corner). If you’d rather store it in another part of your living space, keep a smaller container with a lid in your kitchen for a hassle-free way to toss your food scraps.

Indoor Composting basics

Indoor composting basics

What to add & avoid

Add in any raw plant matter (think peels, pits and cores, rotten fruit/veg, plant cuttings, coffee grounds and used paper filters, nut shells, tea bags- without plastic and string). It is generally recommended for basic indoor composting that you avoid adding meats, bones, fats, cooked food, or dairy, as they can encourage pests and are slower to break down. One exception that I’ve had no trouble with is rinsing out egg shells and crushing them in to the mix.

Aerate frequently

Tumble the contents around very thoroughly at least once per week. The decomposition process requires a lot of aeration, and turning the mixture will help to increase air circulation. When the bin is not being added to or mixed, however, keep the lid firmly in place. Your compost is a living ecosystem that needs to breathe, but does best in the dark!

Keep it moist

Keep the mixture moist, like a damp sponge. If it gets too soggy or begins to smell sour, toss in a few good handfuls of “brown” contents and combine well. If, on the other hand, your compost dries out, the decomposition will be stalled. Adding in a bit of water or watery scraps (i.e. melon, squash) can help kick-start the process once again. If you keep it at the right moisture level, it really shouldn’t smell badly at all.

Compost tea

If any of the compost fluid (“compost tea”) leaks on to the base tray, don’t throw it out—pour it on to your plants! It has earned the reputation of being a “liquid gold” in the gardening world. If you’d like to intentionally make compost tea, drill a few holes through the bottom of the bin in addition to the ones meant for aeration at the top, and decant from the collection tray.

What to do with your compost

It can take anywhere from two to four months for the contents to break down into a rich, soil-like material. When it has, there are a few different ways you might put your final product to use:

  • add it to your own garden bed to help it retain moisture and to feed your plants
  • make your indoor plants happy by adding compost to their potting soil
  • pass it on to a neighbor with a garden
  • donate it to a school or public garden
  • bring to a compost drop-off

If you have some outdoor space, you may want to consider keeping a corner of it open as a place to pile up your completed compost so it’s ready for you to use when you need it.

Why get overwhelmed by products marketed to composting, or by the many different ways to go about it, when it really can be as easy as a plastic bin, some organic scraps, and a mixing tool? There’s something very satisfying about aiding in the natural process of decomposition and seeing first hand the boost it can bring to new life. Give it a try; we’d love to hear about your own composting tips and tricks! 

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