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Coco Coir

A renewable soilless growing medium made from coconut husk fiber, valued for water retention, aeration, and compatibility with drip hydroponic systems.

Troubleshooting

New growth shows calcium or magnesium deficiency after transplanting into fresh coco.

Confirm the coco was buffered, check runoff EC and pH, and use a coco-compatible nutrient or calcium-magnesium supplement before increasing overall feed strength.

Coco stays soggy and runoff is slow after irrigation.

Increase drainage, reduce irrigation duration, blend with pumice or perlite, and avoid letting fine coco particles block container outlets.

Maintenance

Monitor EC and runoff to avoid salt buildup.
Keep evenly moist but avoid constant saturation without drainage.
Rinse and sanitize or compost after use depending on crop health.

Make It Yourself

Hydrate compressed coco coir with clean water until fully expanded.
Rinse or buffer the coir if needed to reduce excess salts and improve calcium-magnesium balance.
Place it in containers, grow bags, or beds with adequate drainage.
Fertigate regularly because coco contains little immediately available nutrition on its own.

Cost

10 - 60 NZD

Specifications

Water retention: high
Aeration: medium to high
pH tendency: near neutral to slightly acidic
Reusable potential: medium

Cultivars

Cultivar	Compatibility
Tomato	excellent
Bell Pepper	excellent
Basil	very good
Carrots	good
Sweet Potato	good

Methods

Method	Compatibility	Notes
Drip Irrigation	excellent
Ebb and Flow	very good
Wick	good
Cylindrical Tower	moderate

Issues

Issue	Description	Remedy
Salt content	Some coco products contain residual sodium or potassium salts.	Rinse and buffer before use, and choose washed hydroponic-grade coco.
Calcium and magnesium binding	Coco can hold onto calcium and magnesium, causing deficiencies if unmanaged.	Use a coco-compatible nutrient or pre-buffer with calcium-magnesium solution.

Advantages

Renewable and widely available
Good water retention with reasonable aeration
Works well in drip systems
Suitable for many herbs and fruiting crops

Disadvantages

May need buffering before use
Can hold salts if runoff is poor
Quality varies by supplier