Vermicast vs compost is a common debate among Filipino gardeners choosing between organic soil amendments. Both improve soil health and feed plants naturally, but they differ in nutrient concentration, cost, and best use cases. Understanding these differences helps you spend your gardening budget wisely and give each plant exactly what it needs to thrive in Philippine growing conditions.
What Are Vermicast and Compost?
Vermicast (Worm Castings)
Vermicast is the excrement of earthworms that have digested organic matter. Worms break down food scraps, paper, and plant material into a fine, dark, odourless material rich in plant-available nutrients. The process takes 2 to 3 months in a worm bin. Vermicast contains beneficial bacteria, enzymes, and humic acids that promote root growth and plant health beyond simple nutrient supply.
Compost
Compost results from the aerobic decomposition of organic matter by bacteria, fungi, and other microorganisms. Kitchen scraps, garden waste, dried leaves, and grass clippings break down over 2 to 6 months into a dark, crumbly material. Compost improves soil structure, water retention, and drainage while providing a moderate supply of nutrients. It serves primarily as a soil conditioner rather than a concentrated fertilizer.
Vermicast vs Compost Comparison Table
| Factor | Vermicast | Compost |
|---|---|---|
| Nutrient density | High. Concentrated NPK plus micronutrients | Moderate. Broader nutrient range but lower concentration |
| Beneficial microbes | Very high. Rich in bacteria, enzymes, and humic acids | Moderate. Good microbial diversity |
| Soil structure | Moderate improvement | Excellent improvement. Adds bulk organic matter |
| Water retention | Good | Excellent. Absorbs and holds moisture well |
| Odour | None. Earthy smell | Slight earthy smell. Can be strong if not fully decomposed |
| Production time | 2 to 3 months with worms | 2 to 6 months without worms |
| Cost per kg (PH) | P80 to P150 | P30 to P80 |
| Best for | Targeted feeding, seedlings, potting mix | Bulk soil amendment, garden beds, raised beds |
| Risk of burning | Very low. Safe at any concentration | Low. Fully composted material is safe |
How to Use Each One
Using Vermicast
- Potting mix. Mix 1 part vermicast with 3 parts loam soil for a nutrient-rich container medium.
- Top dressing. Spread 1 to 2 centimetres of vermicast around plant bases every 4 to 6 weeks.
- Seedling starter. Mix equal parts vermicast and coco peat for a gentle seedling medium.
- Vermicast tea. Soak 1 cup of vermicast in 5 litres of water for 24 hours. Use the liquid as a foliar spray or soil drench.
Using Compost
- Soil amendment. Mix compost into the top 15 centimetres of garden soil at a 1 to 3 ratio before planting.
- Mulch layer. Spread 5 to 8 centimetres of compost around established plants to retain moisture and suppress weeds.
- Raised bed fill. Use compost as 30 to 40 per cent of your raised bed mix alongside garden soil and loam.
- Lawn top dressing. Spread a thin 1-centimetre layer across lawn areas to improve grass health.
Best Plants for Each
- Vermicast works best for: seedlings, herbs, indoor plants, aglaonema, peace lily, and other potted ornamentals that benefit from concentrated nutrients in limited soil volume.
- Compost works best for: vegetable beds, lawn areas, fruit trees, large planting beds, and any situation where you need to improve soil structure across a wide area at reasonable cost.
- Use both together for: raised bed vegetable gardens, premium potting mixes, and high-value ornamental plantings where you want maximum soil health and nutrient availability.
Where to Buy in the Philippines
- Agricultural supply shops. Carry both vermicast and compost in bulk bags at the lowest prices.
- Garden centres. Retail-packed vermicast and compost in 1 to 5 kilogram bags for home gardeners.
- Online (Shopee, Lazada). Wide selection with delivery. Compare prices and check reviews before ordering.
- Local worm farms. Buy vermicast directly from producers for the freshest product at wholesale prices.
- Urban Goes Green shop. Quality soil products delivered same-day across Metro Manila via Lalamove.
Frequently Asked Questions
Is vermicast better than compost?
Vermicast is more nutrient-dense than regular compost per kilogram. Worm castings contain higher concentrations of available nitrogen, phosphorus, and potassium plus beneficial microorganisms that improve soil health. However, vermicast costs 2 to 3 times more than compost. Compost provides better soil structure improvement and is available in larger quantities at lower cost. For best results, use vermicast as a targeted nutrient boost for individual plants and compost as a bulk soil amendment for garden beds.
Can I mix vermicast and compost together?
Yes. Mixing vermicast and compost together creates an excellent growing medium. Combine 1 part vermicast with 3 parts compost for a nutrient-rich, well-structured soil amendment. The vermicast provides concentrated nutrients and beneficial microbes while the compost adds bulk organic matter that improves drainage and water retention. This blend works well for potting mixes, raised beds, and top-dressing established garden beds. Many Filipino gardeners use this combination for starting vegetable seedlings.
How much do vermicast and compost cost in the Philippines?
Vermicast costs P80 to P150 per kilogram in the Philippines depending on the source and quality. Compost ranges from P30 to P80 per kilogram. Bulk purchases reduce the per-kilogram cost significantly. A 25-kilogram bag of vermicast costs P1,500 to P2,500 while a 25-kilogram bag of compost costs P500 to P1,000. Local farms and composting facilities often sell at lower prices than retail garden shops. Both are available at agricultural supply stores, garden centres, and online marketplaces like Shopee and Lazada.
