What is Vermicomposting?
What is vermicomposting? How is it different from composting? What is it for? Why should I do it? Does it actually benefit plants? Me? The planet?
OK, you have come to the right place! I have the answers to these questions and more!
🪱 Composting vs. Vermicomposting: What's the Difference? 🪱
Both composting and vermicomposting are aerobic (requiring oxygen) bio-oxidative (involving a process in which biological systems use oxygen to break down organic compounds) processes, but they differ in some key respects.
Traditional Composting:
- Organic matter is transformed primarily by microorganisms
- Requires regular human intervention for 'activation' - turning the compost pile to introduce oxygen into the system
- Generates heat during decomposition
- Takes longer to produce finished compost
Vermicomposting:
- Organic matter is transformed by both microorganisms AND worms working together
- Does not require human intervention for 'activation' - the worms continuously turn over the compost, exposing it to oxygen 24/7
- Operates at cooler temperatures
- Produces nutrient-rich castings faster than traditional composting
🤔 So... What Does This Mean? 🤔
The earthworms are responsible for the fragmentation of the substrate while the microorganisms—both in the earthworm guts and in the feedstock—are responsible for the biochemical degradation of the organic matter. By fragmenting the substrate, the earthworms increase the total surface area to which the microorganisms are exposed, significantly accelerating the rate of decomposition.
Think of worms as tiny composting machines that work around the clock, creating premium fertilizer while you sleep!
👀 Essential Conditions to Monitor in Your Vermicomposter 👀
🧪 pH Level 🧪
A properly maintained worm bin should have a pH of 6.0 to 7.0, which is ideal for most composting worms. A hydrometer can and should be used to measure the pH in your worm bin.
Warning signs of pH problems:
- Sour, vinegar-like odors from your worm bin
- Worms attempting to escape from the top, bottom, or any openings
- Reduced worm activity or population decline
A poorly managed worm bin pH can be fatal to your worms and ruin any worm compost already made. If you notice your worm population fleeing for no obvious reason, check the pH immediately, along with humidity and food supply.
💦 Moisture 💦
The worm bedding should always be moist but not waterlogged—think of a wrung-out sponge. Worms breathe through their skin, which must stay moist for oxygen to diffuse properly.
Dry bedding can cause the entire population of worms to suffocate, resulting in mass death and the end of your vermicomposter. Too much moisture, however, can create anaerobic conditions and foul odors.
🫧 Oxygen 🫧
Worms do not have lungs—oxygen diffuses from the air through their moist skin. As long as their skin stays moist and they have access to adequate oxygen, the worms will breathe easily.
When worms eat, they tunnel through organic materials and soil, creating air holes that naturally oxygenate the compost. This is why vermicomposting is so efficient!
🥒 What to Feed Your Composting Worms 🥒
Worms don't have teeth—they smush and mash their food. This gives us clear guidelines for what works best.
Texture Guidelines:
- Soft materials work best
- Small pieces decompose faster
- Somewhat moist (this happens naturally if you collect kitchen scraps for a week before feeding—decomposition starts quickly!)
✅ Excellent Worm Food:
- Fruit and vegetable scraps (apple cores, pumpkin seeds, zucchini ends, corn husks, banana peels)
- Coffee grounds and tea bags (remove staples)
- Non-colored, shredded paper and cardboard
- Small chunks of bread and grains (lentils, rice, quinoa, pasta)
- Crushed eggshells (helps balance pH)
⛔ The Forbidden Categories ⛔
- Meat, bones, and dairy (animal byproducts attract pests and create odors)
- Citrus fruits (too acidic, pH imbalancing)
- Spicy or salty food (pH imbalancing, harmful to worms)
- Sawdust from treated wood (chemicals and excessive moisture retention)
- Grass clippings from treated lawns (pesticides and herbicides)
- Oils and fats (create anaerobic conditions)
📌 Practical Tips for Success 📌
⏰ When to Start?
You can start vermicomposting at any time of year as long as you can control the temperature and moisture inside the bin.
Seasonal tips:
- Summer: Keep it cool and moist (avoid direct sunlight)
- Winter: Keep it warm and moist (bring indoors if temperatures drop below 10°C/50°F)
🔢 How Many Worms?
Generally, calculate between 230 to 700g of worms per 30cm² of surface area. Start with fewer worms—they'll reproduce quickly under good conditions!
❓ Why Vermicompost?
The most well-documented effects of vermicompost on plants are accelerated growth, higher resilience, and increased yield. From personal experience, I've noticed:
- Seeds germinate more quickly
- Increased growth rate in the seedling stage and beyond
- Higher resistance to pathogens and diseases
- Natural pest deterrent qualities
- Improved soil structure and water retention
- Reduced need for chemical fertilizers
All in all, it's been a game changer for my plants—allowing them to thrive where others have struggled. And it reduces household waste, creating a beautiful circular economy right in your home or garden.
Our Recommended System: City Worms
The City Worms system is one of the best options available—simple to maintain and harvest for both professionals and amateurs alike.
✅ Positive Points:
- Lightweight design—easy for one person to move or rearrange
- Perfect for indoor vermicomposting systems
- Space-saving stackable design with perforated trays that allow worms to migrate upward, leaving finished castings behind
- Easy to harvest both worm tea and finished fertilizer
- Includes built-in spigot for collecting liquid fertilizer
⚠️ Points to Watch:
- Not extremely heavy-duty—handle trays gently to avoid wobbling
- Drain/spigot needs regular cleaning to prevent blockages
- Bottom collection tray should be cleaned periodically to prevent debris buildup and odors
Ready to Start Your Vermicomposting Journey?
Vermicomposting is one of the most rewarding sustainable practices you can adopt. Not only will you reduce your household waste by up to 30%, but you'll also create premium, nutrient-rich fertilizer that will transform your garden.
Whether you're a seasoned gardener or just starting out, vermicomposting offers a simple, effective way to close the loop on organic waste while nurturing healthier, more productive plants.
Start small, be patient with your worms, and watch your garden—and your environmental impact—flourish!
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