Composting might not be glamorous, but it’s quietly transforming the way we think about waste recycling, soil, and sustainability. Compost returns nutrients to the soil, reduces dumpsites pressure, and supports local food systems.

In this post, we’ll explore how composting works, what compost is, how you could make it at home, and why it matters more now than ever.

What Is Composting – and How Does It Work?

Composting is the natural process of recycling organic matter, such as food and garden waste, into a valuable compost that can enrich soil and support plant growth.

Composting happens all around us, whether we intervene or not with the process nature will eventually break down organic materials. But out in nature, composting can take years – look at fallen tree in a forest. Home and commercial composting is about giving nature a helpful nudge by creating a conducive environment for bacteria, and other microorganisms, to reproduce and work more efficiently.

So, what makes that environment “right”? A few factors come into play:

• Oxygen: Composting is an aerobic process, meaning it needs oxygen to thrive. Microorganisms that break down organic material breathe oxygen, just like we do. Without enough air, the process slows down and can become anaerobic, leading to unpleasant smells (like rotting eggs) and poor-quality compost.
  
  
• Temperature: Heat is both a byproduct and a driver of the composting process. As microbes break down material, they generate heat. Higher temperatures—especially during the thermophilic phase—speed up decomposition and kill off weed seeds and harmful pathogens. Keeping your pile warm (but not overheated) is key to effective composting.
  
  
• Moisture: Microorganisms need water to survive and stay active. If the pile is too dry, decomposition slows to a crawl. Too wet, and it can turn soggy and anaerobic. The ideal moisture level is often compared to a wrung-out sponge—damp but not dripping.
  
  
• Carbon-to-Nitrogen (C:N) ratio: This is the balance between “browns” (carbon-rich materials like dry leaves, straw, or paper) and “greens” (nitrogen-rich materials like food scraps, fresh grass, or manure). Microbes use carbon for energy and nitrogen for growth. The ideal C:N ratio is around 25–30:1. If there’s too much carbon, the pile decomposes slowly. Too much nitrogen, and you might get a smelly, soggy mess.

Each of these elements works together to support the microbial activity that makes composting possible. Get the balance right, and your compost pile will do the hard work for you—quickly, cleanly, and efficiently. Together, these elements influence the three main phases of the composting process:

• Mesophilic Phase: This initial phase may last just a few days. During this time, core temperatures rise to between 20–45°C. Mesophilic (moderate-temperature-loving) organisms start breaking down simple, soluble compounds, and their activity causes the temperature to rise even further.
  
  
• Thermophilic Phase: As temperatures climb to between 55–70°C, thermophilic microorganisms take over. These heat-loving microbes accelerate the breakdown of more complex materials like proteins, fats, and tough plant fibers. Depending on the system, this phase can last from several days to several months.
  
  
• Maturation Phase: In the final stage, things begin to cool down. The temperature and pH levels stabilize, and mesophilic organisms return to finish the job—breaking down any remaining organic material into stable, mature compost. That’s the science in a nutshell. You don’t need a degree in biology to build a good compost pile—but understanding what’s happening under the surface helps you get the best results.
  

Now that we understand how composting works, the next question is: does it play out the same way at home as it does in larger, commercial setups? While the basic principles remain the same, the scale, techniques, and outcomes can be quite different.

Home Composting vs. Commercial Composting: What’s the difference?

While the basic principles of composting are the same everywhere – organic waste + air + moisture = compost – the scale, methods, and outcomes can differ quite a bit between home and commercial composting.

Home Composting

Home composting is small-scale. The materials are often kitchen scraps (like fruit and vegetable peels), garden waste (leaves, grass clippings), and small amounts of paper or cardboard.

It’s simple, low-cost, and doesn’t require much equipment; just some knowledge, consistency, and a bit of space. The resulting compost can be used as fertilizer for home gardens, potted plants, or landscaping. The process can take a few months, depending on how it’s managed.

While composting is a natural process, doing it at home means working with limited space, lower temperatures, and fewer tools for managing pests, pathogens, and odours. That means some materials are best avoided in a home setup.

Commercial Composting

Commercial or community-scale composting, like what we do at our facility in Kwale County, is larger, more structured, and designed to handle higher volumes of organic waste. We receive biodegradable waste from multiple sources: households, markets, and restaurants. This allows us to divert a much larger amount of waste from dumpsites and turn it into valuable compost.

Our process is also more closely monitored. We control the composting conditions (like temperature and moisture), sort materials more thoroughly, and follow standards to ensure the final product is safe, mature, and high-quality – suitable for farming, landscaping, and even commercial sale.

Where home composting is great for individual impact, commercial composting is about systemic change – creating jobs, cleaning up communities, and producing compost at a scale that can support food security and environmental regeneration.

What You Can and Can’t Compost At Home

Not everything belongs in your compost pile. Some items can slow down the process, attract pests, or even harm your plants.

Whether you’re just getting started or want to improve your composting routine, this guide breaks down exactly what you can and can’t compost at home.

✅What You CAN Compost at Home

Greens (Nitrogen-rich materials)

These “wet” items provide nitrogen, which helps feed the microbes that break down your compost.

• Fruit and vegetable scraps (peels, cores, trimmings)
• Coffee grounds and tea leaves
• Fresh grass clippings, plant trimmings, and green leaves

Browns (Carbon-rich materials)

These “dry” items add carbon, helping balance moisture and create structure in your compost pile.

• Dry leaves
• Shredded paper and cardboard (avoid glossy or coloured prints)
• Paper egg cartons
• Sawdust and wood shavings (from untreated wood)
• Straw and hay
• Corn cobs and stalks (chopped up for faster breakdown)

Other Compostables

• Crushed eggshells (rinse and dry for best results)

🚫What You CAN’T Compost at Home

Some materials may attract pests, slow decomposition, or introduce disease or toxins into your compost.

Food Waste to Avoid

• Meat, fish, and bones
• Dairy products (cheese, milk, yogurt)
• Oily or greasy foods
• Cooked foods or leftovers with sauces/spices*(Often contain salt, which can be harmful to plants once composted). In small quantities, they are still ok!*

Problematic Plant Waste

• Diseased or pest-infested plants
• Weeds with mature seeds (they may sprout in the finished compost)

Other No-Nos

• Pet waste (from dogs or cats may carry harmful pathogens)
• Glossy, colored, or plastic-coated paper
• Synthetic fabrics or materials
• Treated or painted wood scraps

Knowing what to compost, and what to avoid, is the first step toward creating healthy, nutrient-rich compost at home.

Home Composting Methods

Once you’ve decided to start composting at home, the next step is choosing a method that fits your space, time, and lifestyle. Below are three of the most common home composting methods; each with its own strengths and trade-offs.

1. Compost Pile

This is the simplest and most traditional method. You create an open heap of organic and compostable material—typically in a garden or backyard.

How it works: Organic materials (“greens” and “browns”) are mixed after an initial prep, turned occasionally to add oxygen, and left to break down over time. Turning the pile regularly helps speed up the process and prevents it from going anaerobic (without the oxygen – like in biogas systems – to produce methane).

Pros:

• Cheap to start: Low-cost or free – no special equipment needed, just your garden tools.
  
  
• Flexible in size: Can be scaled based on how much waste you generate.
  
  
• Easy to fix mistakes: If something is off (like too wet or too dry), it’s easy to adjust, making it a great option for beginners!
  

Cons:

• Requires effort: You’ll need to turn the pile, monitor moisture and temperature, and keep it balanced.
  
  
• Needs bulk to work well: To heat up properly, a compost pile must be a certain size, meaning you’ll need a decent amount of materials (both greens and browns) to get started.

2. Tumbler Composting

Compost tumblers are sealed containers mounted on a frame that you rotate. They’re designed for neater, faster composting and perfect for compact spaces.

How it works: You add organic waste into the tumbler, close the lid, and rotate it every few days. The drum traps heat and circulates air as it turns, speeding up decomposition.

Pros:

• Easy to aerate: Turning is effortless: just spin the drum.
  
  
• Keep the pests out: The enclosed design deters rodents and other scavengers.
  
  
• Good for urban spaces: Ideal for patios, backyards, or areas where pests and smells might be an issue.

Cons:

• Hard to source affordably in Kenya: Compost tumblers can be expensive and not widely available locally.
  
  
• Moisture control is tricky: Because they’re sealed, excess moisture can build up, especially if you add too many “wet” greens without enough “dry” browns.
  
  
• Prone to clumping: If not turned frequently or well-balanced, the contents can form dense clumps that slow decomposition.

3. Vermicomposting (Worm Composting)

This method uses special composting worms (typically red wigglers) to break down food scraps into nutrient-rich worm castings.

How it works: Worms live in a bin with bedding (e.g. shredded paper), and you feed them small amounts of food waste regularly. As the worms digest the material, they produce castings – a high-quality organic compost.

Pros:

• Perfect for food scraps: Great for fruit and veg peels, coffee grounds, tea leaves, and eggshells.
  
  
• No need to turn: The worms do all the work, aerating and mixing the compost as they move.
  
  
• Produces liquid fertiliser: Many worm bins collect leachate (“worm tea”) that can be diluted and used as a plant feed.
  
  
• Educational and engaging: A fun, hands-on way to learn about nature. It’s great for kids and adults as well😊
  

Cons:

• Temperature sensitive: Worms prefer 13–25°C. Extreme heat or cold can harm or kill them, so they need protection in hot or chilly conditions.
  
  
• Limited menu: Avoid feeding worms citrus, onions, garlic, and a few other scraps. These items may cause them to get sick.
  
  
• Initial learning curve: Setting up a worm bin takes some prep; selecting the right bin, worm species, bedding, and feeding routine.
  
  
• Needs attention: You’re caring for living creatures. If you go away, someone needs to check on them, or you’ll need to prep their environment to sustain them while you’re gone.

⚠️Important note: Home composting methods typically do not reach temperatures above 50°C, which means they might not destroy harmful pathogens or weed seeds.

This makes it unsafe to use the resulting compost or compost tea on vegetable gardens, especially for crops you eat raw. However, it is perfectly safe—and incredibly beneficial—for flowers, ornamentals, trees, and landscaping plants.

Before You Build Your Compost Pile

Before you start piling up your compost, it’s important to get prepared. A successful compost system starts with a bit of planning:

• Choose the right location – Pick a well-drained, shady or semi-shady spot that’s easy to access year-round.

• Organize your kitchen waste – Set up a system to separate compostable scraps from the rest of your rubbish. Involve your family so everyone knows what goes where.

• Gather enough garden waste – A good mix of green and brown materials is key, so make sure you have access to things like dry leaves, grass clippings, and trimmings.

• Get the right tools – A garden fork, a small bucket or bin for kitchen waste, and gloves can all make the process easier and more effective.

With a bit of preparation, you’ll be ready to build a compost pile that’s clean, balanced, and easy to maintain.

Let’s Build Your Compost Pile

Now that you know what to compost, have your tools ready, and understand why this matters you’re all set to begin! Building a compost pile is simple once you’ve got the right mix of ingredients and a good location picked out.

Here’s how to get started:

1. Start with a layer of browns

Lay down dry leaves, shredded paper, or small sticks at the bottom of your compost area to allow for airflow and drainage.

2. Add your materials in the right ratio

Mix one bucket of kitchen waste (greens) with three buckets of garden waste (browns) such as dry leaves, sawdust, or shredded paper.

3. Cover your pile with brown garden waste

Always top off your pile with a generous layer of dry browns. This helps retain moisture, protects the pile from weather temperature changes, and acts as a natural bio-filter to reduce odours.

4. Turn regularly

Every 1–2 weeks, remove the top brown layer and set it aside. Then mix the rest of the pile with a garden fork to add oxygen and help everything break down evenly. This is also a good time to add more compostable materials – again, using the 3:1 garden-to-kitchen waste ratio.

5. Moisten as needed

Your compost should feel like a wrung-out sponge – not too dry and not soggy. Add water if the pile is too dry, or add more browns if it’s too wet.

6. Cover your pile again

Replace the dry garden waste layer you set aside on top of the pile. If your compost is growing, add a bit more brown waste to maintain the cover.

7. Watch it transform

Over time, your pile will heat up, shrink, and break down into rich, dark, crumbly compost; perfect for your garden or potted plants. Once the pile becomes too large, it’s best to stop adding new material and start a new pile. This keeps the process manageable and ensures you’ll have finished compost sooner.

Take Care of Your Compost

Building your compost pile is just the beginning! Now it’s time to listen to it and care for it like the living system it is.

Your compost pile is home to billions of hardworking microorganisms (plus fungi, insects, and worms). These tiny soldiers need the right environment to thrive. If you take good care of them, they’ll return the favour by turning your waste into beautiful, fertile compost.

Here’s how to know if your compost is on the right track:

• Is it warm?

A healthy compost pile heats up, sometimes quite a lot! This is a sign that microbial activity is strong. If your pile feels cold and isn’t breaking down, it might need more greens (nitrogen) or turning to let in more oxygen.

• Does it smell earthy?

A well-balanced compost pile should smell earthy, like soil or a forest floor. If it smells sour, the pH is likely too acidic — add some wood ash to neutralize it. A toilet or rotten smell usually means the pile is too wet; add more dry browns (like leaves or shredded paper) and mix thoroughly. If you notice a strong ammonia-like odour, the pile isn’t getting enough oxygen — a good, thorough mix should help restore balance.

• Is it too dry or too wet?

Microorganisms need moisture to survive. If your pile is bone dry, sprinkle some water. If it’s soggy, add dry browns and mix thoroughly.

It should be moist enough to hold together when squeezed, but not so wet that it drips—think of a sponge after you’ve squeezed out the excess water.

• Are you seeing bugs and worms?

Great! Insects, worms, and other small critters help break things down. If you’re not seeing much life, your pile might be too dry or lacking food.

By observing these signs, you’re learning to “listen” to your compost and respond to its needs. It’s a relationship built on balance… and the reward is rich, living compost that will nourish your soil for seasons to come!

The Compost is Ready…Now What?

Months have gone by. You’ve turned, watered, and fed your compost pile like it was a member of your family. You’ve watched it heat up, shrink down, and slowly transform. And now, it’s ready! Dark, crumbly, earthy-smelling compost. You may be asking yourself:

“It looks like soil… can I use it just like soil?”

The answer is: not quite.

Compost is not soil, it’s a powerful soil amendment. It’s full of nutrients, beneficial microbes, and organic matter, but it’s too rich to use on its own like potting soil or topsoil. To get the most out of your compost and avoid harming your plants. Here’s how to use it properly:

✅ How to Use Finished Compost

• As a soil booster: Mix compost into your garden beds or containers: roughly 1 part compost to 2–3 parts soil. This improves soil structure, adds nutrients, and helps retain moisture.
  
  
• Top-dressing for plants: Sprinkle a 1–2 cm layer of compost around the base of trees, shrubs, or vegetables. It feeds the soil slowly and helps suppress weeds.
  
  
• In seed starting mixes (with care): Sift your compost to remove large chunks and mix it with sand or coconut coir to lighten it up. Use it in small amounts for seedlings, as pure compost can be too strong for young roots.
  
  
• For lawn care: Spread a thin layer over your lawn to enrich the soil and support healthy grass growth.

🛑A Few Don’ts

• Don’t plant directly into 100% compost – it can hold too much moisture and overwhelm roots.
  
  
• Don’t store compost in airtight containers. Keep it aerated and dry if storing for later use.

After all your care and patience, your eco-friendly organic fertiliser is now ready to return to the earth—helping plants grow, soil thrive, and your home stay just a little more in tune with nature.

If You Can’t Build Your Own Pile…

Okay, that was a lot! And you might be thinking, “This is more complicated than I expected.” You’re not alone. Many people assume you can just toss some kitchen scraps in a corner and wait for composting to happen. But as you’ve probably realised by now, successful composting takes planning, consistency, and a bit of know-how.

If you’re up for the challenge, go for it! But if building and maintaining your own compost pile doesn’t feel doable right now, that’s totally fine. You still have options to keep your organic waste out of the dumpsite and support organic waste recycling in your community.

Here’s what you can do instead:

• Know someone who composts? Offer them your organic waste! They’ll likely appreciate the extra material.
  
  
• Team up with neighbours to start a shared composting system. It’s a great way to build community while sharing the workload.
  
  
• Check if there’s an organic waste collection service or community composting project in your area. Discover more about what we are doing in KWALE County in this blog post.
  
  
• Need compost for your plants or garden? You can still reap the benefits without making it yourself. We’re happy to help! Just get in touch through our social media channels or send us an enquiry, through this form, and we’ll sort you out with high-quality compost for your home garden or indoor plants.

Final Thoughts

Composting is one of the simplest and most impactful ways to care for the planet, right from your own home. It turns everyday waste into something truly valuable – living, nutrient-rich compost that gives back to the soil and supports healthier plants, gardens, and ecosystems.

Whether you’re ready to build your own pile, share your scraps with a neighbour, or support a community composting effort, every action counts. The more we rethink our waste, the more we realise it’s not waste at all, just a resource waiting to be transformed.

So take that first step. Start small, stay curious, and don’t be afraid to get your hands a little dirty. The soil, and the future, will thank you.