Cocopeat Compound Structure
Understanding what cocopeat is made of helps you use it more effectively as a growing medium.
What is Cocopeat?
Cocopeat (also called coir pith, coco pith, or coco coir) is the fine, spongy material extracted from the husk of mature coconuts during fibre processing. It is a by-product of the coconut industry — specifically the mesocarp layer between the outer shell and the inner coconut.
The material is composed of millions of capillary micro-sponges that give it extraordinary water absorption and retention properties — holding up to 8–10 times its own weight in water.
Chemical Composition
Cocopeat is a lignocellulosic material — its structure is built from three main organic polymers found in plant cell walls:
The structural backbone — long chains of glucose molecules that form rigid microfibrils. Provides the physical framework and strength.
A complex aromatic polymer that binds the fibres together. Makes cocopeat resistant to decomposition and microbial breakdown.
Branched sugar polymers that fill gaps between cellulose fibrils. Creates the sponge-like micro-pores that hold water.
Physical Structure — How It Works
The sponge-like behaviour of cocopeat comes from its unique micro-architecture:
How to Hydrate & Expand Cocopeat
Compressed cocopeat blocks must be properly hydrated before use. Follow these methods for optimal expansion.
Place the block in a large container (wheelbarrow, bucket, or mixing tray) that can hold at least 5× the block's volume.
Add warm water slowly (25–35°C works best). Use approximately 15–20 litres per 5kg block. Warm water accelerates absorption.
Wait 15–20 minutes for the block to absorb water and expand. It will swell to approximately 70–75 litres.
Break apart by hand or with a garden fork. Fluff the material until uniformly loose — no dry clumps should remain.
For grow bags and slabs that come with pre-cut holes, run water directly through the bag using a hose or drip line. The cocopeat expands inside the bag — no unpacking needed. Allow 20–30 minutes for full expansion, then let excess water drain through the drainage slits before planting.
For bulk quantities, place blocks in a lined pit or large mixing bay. Add water in stages — soak, wait, add more. This prevents water run-off and ensures even hydration throughout. Allow 30–60 minutes total. Use a cement mixer for large commercial operations to ensure uniform consistency.
For sensitive crops (tomatoes, strawberries, cannabis), buffer the expanded cocopeat by soaking it in a calcium-magnesium solution (Cal-Mag at 5ml/L) for 8–12 hours, then flush with clean water. This displaces naturally-held potassium and sodium ions and pre-loads the coir with calcium — preventing early-stage nutrient lockout.
Water Retention & Management
Proper water management is the key to getting the best from your cocopeat substrate.
How Cocopeat Retains Water
Cocopeat holds water through two mechanisms:
Water is absorbed into the hemicellulose matrix within each particle. This "internally held" water is released slowly to roots through osmotic gradients — providing steady moisture even between irrigation cycles.
Water clings to the surface of particles and fills the micro-pores between them via capillary action. This water is more readily available to roots and drains when excess is applied — preventing waterlogging.
Watering Best Practices
Cocopeat vs Other Media — Water Properties
Common Water Management Mistakes
Cocopeat Sieving Methods & Grading
Sieving is a critical step in cocopeat processing that determines the texture, uniformity, and suitability of the final product for different applications.
What is Cocopeat Sieving?
After coconut husks are processed and the pith is separated from the fibre, the raw material contains a mix of fine dust, medium particles, short fibres, and larger chunks. Sieving passes this material through screens of specific mesh sizes to separate it into uniform grades — removing oversized particles, fibre clumps, sand, and other impurities. The result is a consistent, clean product ready for compression and export.
Sieving Methods Used in Production
The most common industrial method. Dried cocopeat is fed into a rotating cylindrical drum fitted with mesh screens. As the drum rotates, fine particles fall through while oversized material and fibres are expelled at the end. Capacities range from 300 kg/hr to 1+ tonne/hr. Multiple screen sizes can be used in series for multi-grade separation.
A flat screen vibrates at high frequency, causing particles to separate by size. Better for achieving very fine grades. Multiple mesh layers can be stacked to produce 3–4 different grades in a single pass. Preferred for premium export-grade cocopeat where consistency is critical.
Used by advanced facilities, this combines multiple trommel or vibrating screens in sequence — coarse screen first (10mm), then medium (5mm), then fine (3mm). Each stage outputs a different grade. This produces the widest range of products from a single batch of raw material.
Used by small-scale producers or for quality sampling. Dried cocopeat is rubbed through a hand-held mesh frame. Slower but allows visual quality inspection. Often used for fibre content testing — separating pith from fibre by hand for accurate measurement.
Standard Mesh Sizes & Grades
Benefits of Proper Sieving
Frequently Asked Questions
Cocopeat is the fine, spongy material from coconut husks — excellent for water retention. Cocochips are larger, chunky pieces that provide superior drainage and aeration. Many growers blend both for optimal results.
A standard 5kg compressed block expands to approximately 70–75 litres when hydrated with water. The expansion takes about 15–20 minutes.
Washed cocopeat has been rinsed with fresh water to reduce natural salts (lower EC). This is essential for sensitive crops like tomatoes and strawberries. Unwashed cocopeat is suitable for soil amendment and less salt-sensitive applications.
We offer sample orders starting from 50–100 kg. For commercial orders, our minimum is typically 1 tonne. Full container loads (20+ tonnes) receive the best pricing.
Yes. We offer private labelling and custom packaging for all our products. Contact us with your branding requirements and we'll provide a quote.
We export worldwide — primarily to Europe, USA, Canada, Middle East, Japan, China, and Southeast Asia. We ship from Hambantota Port in southern Sri Lanka.
Raw coir naturally holds sea-salt residues (sodium and chloride) that can harm sensitive crops. Washing flushes these out and lowers the electrical conductivity (EC):
1. Fully hydrate the coir with clean, low-EC water and let it expand.
2. Drench and drain repeatedly, letting water pass through freely each time.
3. Check the run-off EC and keep rinsing until it reads below your target (our triple-washed grade reaches EC <0.5 mS/cm).
Washing removes salts but does not address bound calcium and magnesium — that's what buffering is for.
Coir naturally holds calcium (Ca) and magnesium (Mg) on its exchange sites and releases them in exchange for potassium and sodium. Untreated, it will "steal" calcium from your nutrient feed and dump sodium back — causing deficiencies. Buffering pre-loads those sites with Ca/Mg so the coir is stable from day one:
1. Wash the coir first to strip loose salts.
2. Soak it in a calcium-magnesium nitrate (CalMag) solution — typically around 5–8 kg per m³ — for 8–24 hours.
3. Rinse once with clean water to flush the displaced sodium away.
4. Drain — the coir is now stabilised and ready to plant.
Our washed & buffered grades arrive pre-treated, so you can plant straight into them without a nutrient lock-up phase.
Properly dried, well-packed blocks are stable for 12–24 months, so a few extra months is usually fine. Problems only arise when residual moisture or humidity is high during storage:
• Mould / fungal bloom — white or green surface growth on blocks that were packed slightly damp or stored in a humid space.
• Compaction & hard rehydration — long compression makes blocks denser and slower to expand, sometimes needing warm water and extra soak time.
• Musty odour — from trapped moisture, not usually a sign the coir is unusable.
• Slight EC rise — salts can migrate as internal moisture moves.
How to mitigate it:
Store blocks off the floor in a dry, ventilated, shaded area on pallets, keeping the original moisture-barrier wrap sealed until use. Before planting, fully hydrate with clean warm water, let the block expand completely, then rinse (and re-buffer if needed) to reset EC. If you see mould, break open and inspect: light surface mould can be rinsed and the coir sun-aired or lightly heat-treated (≤70°C) before use; heavily contaminated or sour-smelling material should be discarded. Rotate stock first-in-first-out to avoid long holds.
Yes, mildly. The longer coir sits under compression, the more the fibres "set," so an over-kept block tends to expand a little less and more slowly than a fresh one. A block that normally opens to 70+ L may reach only ~90–95% of that if held well past its window — and it will take longer to break apart.
The bigger factor is moisture: blocks that dried out further in storage rehydrate stiffly, while blocks that absorbed humidity can feel expanded but yield less usable volume. True fibre damage (permanent volume loss) only happens with mould, rot, or repeated wet-dry cycling — not from age alone.
To recover full expansion:
Soak in warm water (30–40°C) and allow extra time — an over-kept block may need 30–45 minutes instead of the usual 20. Gently break it up by hand as it softens to speed even absorption, and use more water than usual. Once fully open, fluff the coir and let it drain; most of the original volume returns.
Coir is sold by weight and volume, so low-cost operators cut corners in ways that lower their cost but hurt your crop. Common tricks to watch for:
• Adding fine dust / "pith fines" — over-milled dust is cheap but collapses air porosity and waterlogs roots.
• Sand, soil or filler — added to hit target weight; inflates ash content and adds no growing value.
• Skipping washing / buffering — selling raw, high-salt coir as "washed" (high EC, high sodium).
• Under-drying — extra moisture is extra weight you pay for, and invites mould.
• Old or mixed-grade fibre — blending immature or decomposed husk to bulk up a batch.
• Over-compression / underweight blocks — blocks that expand to less than the stated litres.
How to protect yourself:
Always request a lab report (EC, pH, moisture %, and ash/inert content), test a sample before bulk orders, and check expansion volume yourself by hydrating one block. Sniff for musty odours, rub the material to feel for gritty sand, and confirm the supplier states washing/buffering grade in writing. At Ceylon Substrates every batch is sieved, graded, washed and lab-tested — with documentation supplied on request.
Both come from the same coconut, but growing conditions, coconut variety and processing traditions give them different characteristics. In general:
• Fibre & pith quality — Sri Lankan coir is prized for longer, stronger, more resilient fibre and a cleaner, more consistent pith. Indian coir is produced at massive scale and quality can vary more between suppliers.
• Salt / EC — much Indian coir is processed near coasts with brackish or backwater retting, so raw EC is often higher and needs more washing. Sri Lankan coir typically starts with lower salt loads.
• Colour & maturity — Sri Lankan pith tends to be a rich, uniform brown from mature husks; heavy over-milling and dust are more common in the cheapest Indian grades.
• Price & volume — India offers lower prices and enormous supply capacity; Sri Lanka positions more on premium, consistent, export-grade material.
The honest bottom line: origin is a guide, not a guarantee — a well-processed, washed, buffered and lab-tested product matters more than the country label. Ceylon Substrates delivers Sri Lankan coir with full quality documentation so you get the origin's natural advantages backed by verified specs.
For crop production, sun drying is generally more suitable. Its gentle heat preserves the sponge-like structure that gives cocopeat its water-holding and rehydration capacity, keeping it easily wettable. High-temperature oven drying can collapse this structure and make the coir hydrophobic (water beads up and runs off) — a real problem for seed germination and root establishment.
The trade-off is sterility: sun drying alone doesn't kill pathogens, fungal spores, or weed seeds, and does nothing about salt content (EC). Washing and buffering to reduce EC is essential either way. Most commercial producers use a hybrid approach — sun-dry to cut cost and protect structure, then finish with mild heat or steam (around 60–70°C, no higher) for moisture control and sterilisation.
Best for crops: Sun-dried + washed/buffered + mild sterilisation · Good: Low-temp oven-dried (≤70°C) + washed/buffered · Avoid: High-temp oven drying
| Parameter | Oven Drying | Sun Drying |
|---|---|---|
| Temperature | Controlled, 60–105°C | Ambient/solar, 30–50°C |
| Drying time | Fast — a few hours | Slow — 1 to several days |
| Moisture achieved | Low & consistent (<10–12%) | Higher residual (15–20%+) |
| Uniformity | Very uniform throughout | Uneven — surface dries first |
| Water-holding capacity | Reduced if overheated | Better preserved |
| Hydrophobicity risk | Higher at high temps | Low — stays wettable |
| Sterilisation | Good — kills pathogens & weed seeds | Poor — doesn't reliably sterilise |
| Energy cost | High (fuel/electricity) | Very low (free solar) |
| Weather dependency | None — fully controlled | High — rain & humidity interrupt |
| Best suited for | Standardised, sterile, export-grade blocks | Low-cost bulk processing |
Water-holding capacity depends on particle size — the finer the material, the more water it retains, while chunkier grades trade retention for drainage and air porosity. The figures below are typical ranges for washed, buffered coir. Blending peat with chips lets you dial in the exact balance your crop needs.
Rule of thumb: higher water-holding suits thirsty crops and warm climates; higher air porosity suits deep-rooted or disease-sensitive crops and cooler, humid greenhouses.
| Product | Particle Size | Water Holding | Air Porosity | Best For |
|---|---|---|---|---|
| Cocopeat (fine) | 0–2 mm | Very high (8–10× own weight) | Low (10–20%) | Seed starting, water-loving crops |
| Peat / chip blend | Mixed | High (balanced) | Medium (20–35%) | Tomatoes, peppers, cucumbers |
| Cocochips | 6–18 mm | Moderate (4–6× own weight) | High (35–50%) | Orchids, deep-rooted crops |
| Husk chunks | > 20 mm | Low | Very high (50%+) | Drainage layers, anthuriums |
Have a Question?
Our team is always happy to help with technical queries, product advice, or custom requirements.
Contact Us