What Is Compost?
Compost vs vermicast is a question every serious Filipino gardener faces when choosing organic amendments. Compost is decomposed organic matter created through aerobic breakdown of plant material, kitchen scraps, and garden waste. Bacteria, fungi, and other microorganisms do the heavy lifting over 2 to 4 months.
Good compost looks dark, crumbly, and smells like forest soil. It adds bulk organic matter to your garden, improving soil structure, water retention, and drainage all at once. Filipino gardeners commonly compost banana peels, vegetable trimmings, dried leaves, rice straw, and coconut coir.
The biggest advantage of compost is volume. You can produce large quantities at home for free using everyday kitchen and garden waste. A single household can generate enough compost to sustain a small vegetable garden year-round through proper composting techniques.
What Is Vermicast?
Vermicast (also called worm castings or vermicompost) is organic matter that has been digested and excreted by earthworms. African night crawlers are the preferred species in the Philippines because they tolerate tropical heat and process food quickly.
Vermicast is a concentrated, nutrient-dense amendment. Worm digestion breaks down organic matter into forms that plants absorb immediately. Studies show vermicast contains 5 times more nitrogen, 7 times more phosphorus, and 11 times more potassium than average garden soil.
Beyond raw nutrients, vermicast is packed with beneficial microbes, enzymes, and humic acids that stimulate root growth and disease resistance. It is the premium organic amendment for container gardens and seed starting.
Key Differences: Compost vs Vermicast
| Criteria | Compost | Vermicast |
|---|---|---|
| Production Time | 2 to 4 months | 3 to 4 months |
| Nutrient Density | Moderate | High (5 to 10x richer) |
| Microbial Content | Good | Excellent (diverse microbiome) |
| Bulk Volume | Large quantities easily | Smaller quantities |
| Cost (Buy) | P20 to P40 per kg | P50 to P150 per kg |
| Cost (DIY) | Free (kitchen scraps) | Worm starter cost P300 to P500 |
| Smell | Mild earthy | Almost odourless |
| Soil Structure | Excellent improvement | Good improvement |
| Best Application | Soil amendment, mulch | Potting mix, top dressing |
| pH Effect | Varies (slightly acidic to neutral) | Neutral (pH 6.5 to 7.0) |
When to Use Compost
Compost is your go-to amendment for large-scale soil improvement. Choose compost when:
- You need to improve poor-quality native soil across a large garden bed
- You are building new raised beds and need bulk organic matter
- You want a free soil amendment from household waste
- You are mulching around established plants and fruit trees
- You need to loosen heavy clay soil or add body to sandy soil
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When to Use Vermicast
Vermicast delivers concentrated power in small doses. Choose vermicast when:
- You grow in containers where every gram of soil must deliver maximum nutrition
- You start seeds or transplant seedlings and want strong root establishment
- You need an odourless amendment for indoor or balcony gardens
- You want to boost fruiting and flowering with natural nutrients
- You make worm tea for foliar feeding
Which Should You Choose?
Use both. Compost and vermicast serve different purposes and work best together. Mix compost into your soil as a bulk amendment at a ratio of 30%. Then add 10 to 15% vermicast to your potting mix for concentrated nutrition around plant roots.
If you must choose one, pick compost if you have a large in-ground garden and need volume. Pick vermicast if you grow in containers and need nutrient density in limited soil space.
Both are far superior to synthetic fertilizers for long-term soil health. Start composting your kitchen scraps today and consider investing in a small worm bin for premium vermicast production at home.
Frequently Asked Questions
Is vermicast better than compost for plants?
Vermicast is more nutrient-dense than regular compost, with 5 to 10 times more beneficial microbes and higher concentrations of nitrogen, phosphorus, and potassium. It works faster and produces stronger plant growth. However, compost is cheaper to make at home and adds more bulk organic matter to improve soil structure. For best results, use both: compost as your base soil amendment and vermicast as a concentrated nutrient booster around plant roots.
How much vermicast should I add to potting mix?
Add 20 to 30% vermicast to your potting mix by volume. A good container recipe is 50% loam soil, 25% vermicast, 15% compost, and 10% rice hull or perlite. For seedlings and transplants, place a handful of vermicast directly into the planting hole before setting the plant. Avoid using more than 40% vermicast as pure worm castings can retain too much moisture and suffocate roots.
Can I make compost and vermicast at home in the Philippines?
Yes. Compost is the easier one to start with. Layer kitchen scraps, dried leaves, and garden waste in a bin or pile, keep it moist, and turn it every two weeks. You will have usable compost in 2 to 3 months. Vermicast requires African night crawlers (the best worm species for Philippine heat), a shaded worm bin, and regular feeding with vegetable scraps. Worms can process half their body weight in food daily and produce castings in 3 to 4 months.
