Vermicompost - Composting with Decomposing Worms - Basic Facts and Small Scale Systems

Lucian:
This Saturday, February 28th, I’ll be teaching a hands-on vermicomposting workshop as part of the Train to Sustain series. Over time, I’ve realized that some people prefer printed handouts, while others appreciate having digital access to the same materials so they can revisit them later. So today I’m sharing one of our workshop handouts here on the website.

If you scanned the QR code during the workshop — welcome. You’re exactly where you’re meant to be.

If you’re receiving this by email — this is the same resource participants are using in our live training.

I taught this material for eight years in Carlsbad, Southern California to backyard gardeners who wanted to grow food more naturally and build living soil at home. After moving to Missouri, I also taught vermicomposting for about a year to large-scale farmers, focusing on farm-level production systems and practical agricultural applications. On our farm, of course, we have multiple small and medium sized systems, producing enough for vermicompost extracts and aerated teas to use on a regular basis during our growing season. I’ll share more about those larger-scale systems in a future post.

This guide, however, focuses on small-scale worm bin systems — simple, powerful setups that can transform kitchen scraps into biologically rich compost for gardens and small farms.
It covers:

• What vermicompost is
• How it is different from hot compost
• Who the decomposing worms are
• How much they can process
• How to build and care for a simple bin system

This is just one resource in a growing series from Sun & Bloom Farms centered on composting, soil regeneration, and practical, resilient growing systems.
Below is the full handout:

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Vermicompost - Composting with Decomposing Worms - Basic Facts and Small Scale Systems

What is it, why use it, who makes it?
Vermicompost is a rich, humus-like compost made when specialized worms transform food scraps and organic materials into nutrient-dense castings (worm manure). It is often called the black gold of organic and regenerative gardening and farming. It can be produced faster and is more biologically active than thermophilic (hot) compost. 

Compared to conventional compost, vermicompost provides: 1. Higher levels of plant-available nutrients; 2. Strong microbial activity; 3. Improved soil structure; 4. Better moisture retention; 5. Natural plant growth stimulation; 6. Greater disease suppression; 7. More pest resistance support.

The most common decomposing worms used in farm and home scale operations are epigeic worms, such as Eisenia fetida – Red Wigglers (most common & hardy), European Nightcrawlers and Indian Blues - these species are not earth worms!

Quick Worm Facts
Under optimum conditions:

• 1 pound of worms can process ½–1 pound of organic material per day
• 1 pound of organic material processed = approximately ½ pound of vermicompost
• Worms can double their population every 2–3 months 
• They live and work in the top 12–18 inches of material 
• Their maximum population density is about 500 to 1,000 worms (0.5 - 1 pound) per square foot

How Can Vermicompost Be Used?

• Mix 10–40% into potting soil
• Top dress garden beds (½–1 inch)
• Add directly to planting holes
• Make vermicompost extract (simple soak in water)
• Make aerated compost tea (best use) (use as soil soak or spray on plants)

Simple Worm Bin System Start-up - For Home Garden or Small Farm

1️⃣ Container: Plastic or wood bin with drainage holes / Lid should allow airflow (not airtight) + Catchment tray underneath for drainage 

2️⃣ Bedding (Worm Habitat): Start with 3–4 inches of moist bedding - best options include: Shredded corrugated cardboard / Shredded newspaper (non-glossy) / Coconut coir / Peat moss. Add a small handful of: soil, sand, or crushed eggshells (grit for digestion). Moisture should feel like a wrung-out sponge (worms breathe through their skin, so this is critical).

3️⃣ Add Worms: place gently on top of bedding - they will move down naturally away from light.

4️⃣ Feeding: Start feeding about ½ the weight of the worms. Best Foods (Always): Fruit & vegetable scraps / Coffee grounds / Tea bags (plastic-free). The smaller the food particles the faster they will be decomposed (food processor can help) Sometimes: Rinsed eggshells / Grass & garden clippings (no pesticides). Avoid: Meat, bones, dairy / Oily or spicy foods / Processed foods / Large amounts of citrus or onions. Bury food under bedding each time (prevents attracting flies, bugs and other pests).

​5️⃣ Ongoing Care: ✔ Keep bedding moist (70–90% ideal) ✔ Keep temperatures between 60–80°F ✔ Ensure airflow ✔ Do not mix or disturb unnecessarily ✔ Add new bedding as old bedding disappears ✔ Feed again only when most food is gone.

6️⃣ Harvesting: You can harvest castings anytime once material looks dark and soil-like. Ways to harvest: 1. Push contents to one side and add food to the other; 2. Worms migrate to fresh food; 3. Remove finished compost; 4. Use in your desired way, right away, or store in a shaded cool place.

Ideal Conditions At a Glance:  ✔ Moisture: Like a wrung-out sponge ✔ Temperature: Active above 50°F (best 60–75°F) ✔ pH: Neutral is ideal ✔ No chemical contamination ✔ No anaerobic (smelly) conditions ✔ If it smells bad → add more dry bedding.

Beyond the Bin:  Vermicomposting can also be done at larger farm and commercial scales in windrows, beds, or flow-through systems, both in outdoor and indoor/controlled conditions. The Global Vermicompost Market is expected to account for $1.9 billion by 2028. But a simple bin is enough to transform kitchen waste into powerful soil.​

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Continue the Regenerative Journey

If this guide was helpful and you’d like to go deeper, there are several ways to continue learning with Sun & Bloom Farms:

Upcoming Workshops
We regularly offer hands-on workshops on composting, mushroom cultivation, permaculture design, soil regeneration, and practical homestead systems.
View upcoming events: https://www.sunandbloomfarms.com/farm-events.html

Garden & Farm Design Consulting
If you’re ready to design or redesign your garden, homestead, or farm using regenerative and permaculture principles, we offer consulting and full design services.
Learn more about it: https://www.sunandbloomfarms.com/designconsult.html

Stay Connected
Follow along for future trainings, resources, and field notes from our work in Missouri and beyond.
Instagram / Facebook / YouTube: @sunandbloomfarms

We’re here to support your regenerative journey — from kitchen scraps to thriving ecosystems.