COIR MULCH VS WOOD MULCH
Two mulches that do the same job in the ground but behave differently over a season. The honest comparison.
What each one is
Wood mulch is shredded or chipped bark and wood, usually from hardwood or softwood trees. It is the most common mulch in landscaping and horticulture. Coir mulch is made from coconut husk, processed into a fibrous mat or chips that spread over the soil surface.
Both do the same job: cover the soil, reduce evaporation, suppress weeds and moderate soil temperature. The differences are in how long they last, how much water they hold and what they cost.
Where wood wins
Wood mulch is cheaper per cubic metre and lasts longer before breaking down. A 50 mm layer of hardwood bark can last two to three seasons. It is widely available and easy to source in most markets.
For large landscaping projects where cost per square metre is the main driver, wood mulch is the default choice.
Where coir wins
Coir mulch holds 30 to 50 percent more water than bark mixes, according to a Washington State University study. That water holding is not just in the mulch itself, it transfers to the soil below. Plants in coir-mulched beds need less frequent irrigation.
Coir also contains lignin, the compound that makes wood rigid. That means coir mulch breaks down more slowly than straw or bark chips, though not as slowly as large hardwood bark.
The honest comparison
| Property | Coir mulch | Wood mulch |
|---|---|---|
| Water retention | 30 to 50 percent higher than bark | Lower |
| Longevity | Moderate, breaks down in 1 to 2 seasons | 2 to 3 seasons for hardwood bark |
| Cost per cubic metre | Higher | Lower |
| Weed suppression | Good | Good |
| Best for | Water-sensitive crops, containers, dry climates | Large landscapes, long-lasting cover |
When to choose coir mulch
- Water is the constraint. In dry climates or on slopes where irrigation is limited, coir's water holding is worth the higher cost.
- Containers and raised beds. Coir mulch is lighter than bark and easier to handle in pots.
- As a blend component. Coir mulch is often blended with bark to add water holding without the full cost of a pure coir layer.
What we supply
We supply coir mulch in compressed blocks that expand with water, and in loose bulk for large landscaping projects. We can also supply coir mulch as a blend component for mulch companies that want to add water holding to their existing bark or wood product lines.