Choosing a growing substrate is not a commodity decision. The substrate your crop grows in for the next 11 months determines root oxygen availability, nutrient storage between feeds, structural integrity under repeated irrigation, and your ability to comply with incoming EU peat regulations. Most suppliers present their own product in isolation. This datasheet presents all five side by side.
The Ten Properties That Actually Matter
Commercial horticulture has largely converged on the same set of substrate quality metrics. Here is how the five most widely used growing media compare across each of them.
| Property | Coco Coir (Rise Substrates) |
Perlite | Rockwool | Peat Moss | Vermiculite |
|---|---|---|---|---|---|
| CEC (meq/100g) | ✓ 60–100 Highest in class |
✗ 0 No retention |
✗ 0–2 Negligible |
— 100–200 EU ban 2030 |
— 10–15 Minimal |
| Air-Filled Porosity (AFP %) | ✓ 20–30% Ideal root oxygen |
— 45–60% Too high, dries fast |
✓ 35–55% Good AFP |
✗ 5–20% Anaerobic risk |
— 15–25% Moderate |
| Water Holding Capacity (WHC %) | ✓ 55–65% Balanced reservoir |
✗ 5–15% Dries too quickly |
✓ 50–70% Good WHC |
— 60–80% Compacts over time |
— 40–55% Adequate |
| Compression Ratio | ✓ 1 : 7 75L per 5KG block |
✗ 1 : 1 Ships at full volume |
✗ 1 : 1 Ships at full volume |
✗ 1 : 2 Minimal saving |
✗ 1 : 1 Ships at full volume |
| EC on Delivery (mS/cm) | ✓ < 0.3 Batch documented |
— ~0 Inert |
✓ < 0.5 Low |
— 0.2–0.8 Variable |
— ~0 Inert |
| Compostable / Biodegradable | ✓ Fully Agricultural byproduct |
✗ No Landfill at season end |
✗ No Glass fibre waste |
— Slow Peat bog depletion |
✗ No Mining residue |
| EU Peat Regulation 2030 | ✓ Compliant No restrictions |
✓ Compliant | ✓ Compliant | ✗ NON-COMPLIANT Phase-out underway |
✓ Compliant |
| Renewable Origin | ✓ Yes Coconut harvest waste |
✗ No Volcanic mining |
✗ No Energy-heavy production |
✗ No 1,000 years to form |
✗ No Mined mineral |
| Structural Life | ✓ 11+ months High-lignin matured |
— Season only Compacts over time |
✓ 12+ months Durable |
— Season only Degrades quickly |
— Season only Loses AFP over time |
| Sand Content | ✓ < 2% Batch documented |
— N/A | — N/A | — Variable | — N/A |
Why CEC Matters More Than Most Growers Think
Cation Exchange Capacity is the substrate's ability to hold and release nutrients between irrigation events. A substrate with zero CEC — like perlite or rockwool — cannot buffer nutrients at all. Any interruption in irrigation means an immediate interruption in nutrition. At 60–100 meq/100g, coco coir holds a meaningful nutritional reserve that protects the crop during gaps, equipment failures, and irrigation timing errors.
Perlite CEC = 0. Replace 50% of your perlite blend with coco and CEC rises to 30–50 meq/100g instantly. Better product specification at lower input cost — with no change to your label beyond "coco peat enriched."
The Compression Ratio Argument Every Formulator Should Run
Formulators and distributors buy substrate by the kilogram and sell it by the litre. Perlite ships at 1:1 — what you buy is what you ship out. Coco ships at 1:7 compression. One 5KG block expands to 75 litres on your blending floor. The same freight cost delivers seven times more substrate volume. Run the landed cost per litre for your current perlite order and compare it to coco at 1:7. The margin difference is rarely small.
The EU Peat Regulation Is Not a Future Problem. It Is a Supply Chain Deadline.
The European Union's phased restriction on peat use in growing media is already in motion. Operations still running peat-dominant blends face sourcing restrictions, retail listing pressure, and reputational risk in export markets. Coco coir is the established replacement — compliant, renewable, and technically superior for most commercial crops.
Sand Content: The Hidden Cost in Your Container
Industry average sand content in coco coir is 8–12%. At 12% sand, a 22-tonne container carries 2,640 kg of dead weight that you paid full freight on — weight that contributes nothing to your growing media volume and wears blending equipment. Rise Substrates targets less than 2% sand on every batch, documented in the batch report that ships with every container.
What Ships With Every Rise Substrates Container
Every container comes with a batch report covering six measured parameters: EC on delivery, particle size, pre-press moisture content, volume yield sample, sand content, and the batch number. Not estimates — measured values from that production run. The batch report is the difference between a quality claim and a quality record.