You have just purchased coco coir substrate. It is one of the best natural conditioners to improve the structure, aeration, and water retention of any agricultural soil, gardening substrate, or hydroponic grow bed. It comes in compacted blocks that expand up to 5 times their volume when hydrated: a 25 kg bag turns into 250-300 liters of useful substrate. In this guide, we explain how to choose the texture and how to hydrate it correctly.
Product Specifications
Coco coir substrate comes in vacuum-compacted blocks of natural fiber extracted from the coconut husk. Available in two textures (fine pith or coarse chips) and two packaging formats (bag of 5 blocks or full pallet of 240 blocks). Texture choice determines the application; format depends on the volume needed.
| Specification | Pith bag | Pith pallet | Chips bag | Chips pallet |
|---|---|---|---|---|
| SKU | 222455 | 124124 | 234600 | 632410 |
| Texture | Pith 0-6 mm | Pith 0-6 mm | Chips 12-18 mm | Chips 12-18 mm |
| Packaging | Bag 5 blocks | Pallet 240 blocks | Bag 5 blocks | Pallet 240 blocks |
| Weight | 25 kg (55 lb) | 1200 kg (2645 lb) | 25 kg (55 lb) | 1200 kg (2645 lb) |
| Hydrated vol. | ≈ 250 L | ≈ 12000 L | ≈ 250 L | ≈ 12000 L |
Step-by-step for hydrating and using
The compressed block needs pre-hydration before any use. Using the dry block directly will ruin crops: it will absorb all available moisture and leave seedlings under water stress.
Check how many blocks you need
Each block hydrates approximately 50 liters of useful substrate. Calculate the final volume you need and divide by 50: for 250 liters, a whole bag (5 blocks); for 1 m³ (1000 L), 4 bags or 20 blocks. For intensive professional use, the pallet format is more economical per block.
Place the block in a large container
Use a wheelbarrow, large trough, 100 L plastic container or more. The container should be at least 5 times the volume of the dry block to accommodate expansion. If you are hydrating several bags, use several containers in parallel or a tank-type one.
Add water and wait
Add water: approximately 25 liters per block (1:5 ratio). Use clean water, ideally rainwater or fresh water. Avoid high-chlorine water (let it sit for 24 hours in an open container if it's tap water). Wait 30-60 minutes: the block will begin to expand from within. Don't rush: the longer you wait, the more even the hydration.
Break it up with a fork
When the block looks spongy, break it up with a garden fork, gloved hand, or motorized mixer for large-scale work. The fiber should be loose, spongy, and uniformly moist. If you notice a dry, compacted core in the center, add more water and wait another 30 minutes. The final texture should be light, without compacted pieces.
Fine pith (0-6 mm) retains more moisture and is the choice for seedbeds, indoor plants, propagation by cuttings, and small pot mixes. Coarse chips (12-18 mm) provide superior aeration and are the option for hydroponics, orchids, plants that suffer from waterlogging, large pots, and mixes to improve heavy soils. For general garden use, a 70% pith + 30% chips mix provides the perfect balance.
Mix with base substrate or use directly
To improve heavy garden soil: mix 30-50% coco coir with 50-70% existing soil, incorporate with a fork into the top 20 cm. For seedbeds: use directly or with 20% vermiculite. For hydroponics: use pure chips as an inert medium. For pots: mix with commercial substrate at 30-50%.
For professional production, hydrate the blocks the day before use and let them sit covered with a damp sack. This overnight period allows for perfect moisture homogenization and releases any excess natural coconut tannin. The next day, the fiber is ready, loose, and with a neutral smell. Hydrating and using immediately can leave areas still compressed or with uneven moisture.
Do not use the dry block directly on recent crops or plantings. Compacted coco coir absorbs huge amounts of water to hydrate: if placed dry around plants, it will suck all the moisture from the soil and neighboring roots, causing severe water stress. Always hydrate beforehand in a container and apply the material already expanded and moist.
Pith or chips for your crop?
If you have doubts about whether your crop needs fine pith or coarse chips, or how to proportion the mix with your existing soil, ask the virtual assistant. It will guide you according to the type of crop and your soil characteristics.
Complementary products
Coco coir substrate is a conditioner that combines well with various products from our catalog:
Paspalum and Bermuda grass seeds improve their germination when coconut fiber is incorporated into the topsoil horizon: perfect aeration and water retention for germination. The coconut biomat is the cover version of the same fiber: both products share the same origin and complement each other in revegetation projects where the coconut fiber goes into the substrate and the biomat to the surface.
Maintenance and care
Compressed substrate can be stored for years if kept properly:
- Storage of dry block: In a dry place, on a pallet to avoid contact with the ground. The blocks are hygroscopic: warehouse humidity causes partial expansion and renders the batch unusable. The original plastic bag protects well if it is not broken.
- Shelf life of dry block: Indefinite under dry conditions. Coconut fiber does not degrade over time in a dry, compacted state.
- Hydrated shelf life: Once hydrated, use within a few days. Wet fiber stored in a closed bag may start to ferment and develop an unpleasant odor.
- Shelf life in cultivation: Coconut fiber does not decompose quickly: a garden mix with 30% fiber maintains improved aeration for 2-3 years before needing replacement.
- Recycling: Used coconut fiber can be composted at the end of its useful life along with other green materials to produce high-quality compost.
Frequently asked questions
Does coconut fiber have salinity?
Tropical coconut fiber contains a certain amount of residual potassium and sodium from the natural process in coastal areas. Our fiber is pre-washed with low salinity (EC ≥1.5 mS/cm), suitable for most crops. For sodium-sensitive crops (blueberries, delicate fruit trees), perform an additional wash by watering the already hydrated block two or three times and discarding the drainage water before mixing with the base substrate.
Can I mix pith and chips in the same pot?
Yes, it's the preferred mix for many professionals: 70% pith for water retention + 30% chips for aeration provides the right balance for most potted plants. For plants that dislike wet soils (cacti, succulents), reverse the proportion: 30% pith + 70% chips or use pure chips.
Do I need to add nutrients?
Coconut fiber is a nutritionally almost neutral substrate: it provides structure and retention but few nutrients. For use in garden substrate, mix with garden soil, compost, or commercial substrate that provides the nutrients. For hydroponics, always use a complete nutrient solution. For seedlings, nutrients are applied via irrigation to young plants.