Coco Coir for Herbs: Growing Basil, Mint, and More

Herbs are some of the easiest and most rewarding plants to grow — and coco coir is an excellent growing medium for them. Whether you are growing basil on a sunny windowsill or mint in a patio container, coco coir's moisture retention and aeration create ideal conditions for healthy, productive herb plants.

Why Coco Coir Works Well for Herbs

• Excellent drainage — most herbs hate sitting in waterlogged soil. Coco Coir drains freely whilst retaining enough moisture.
• clean and safe — no fungal spores, weed seeds, or pests. This is especially important for indoor herb growing.
• Lightweight — ideal for windowsill pots and hanging herb planters.
• Easy to rehydrate — if a pot dries out, coco coir absorbs water immediately (unlike peat, which becomes hydrophobic).
• Peat-free — grow your herbs sustainably.

Best Coco Coir Mix for Herbs

Most herbs grow best in a well-draining mix. Our recommended recipe:

• 70% coco coir — provides moisture retention and structure
• 20% perlite — improves drainage and prevents compaction
• 10% worm compost or slow-release fertiliser — provides nutrients

For Mediterranean herbs (rosemary, thyme, lavender, sage) that prefer drier conditions, increase perlite to 30% and reduce coco coir to 60%.

Growing Popular Herbs in Coco Coir

Basil

Basil loves warmth and consistent moisture — exactly what coco coir provides. Sow seeds on the surface of moist coco coir, cover lightly, and keep at 20–25°C. Seedlings emerge in 5–10 days. Feed weekly with a balanced liquid fertiliser once established.

Mint

Mint is vigorous and easy to grow in coco coir. Use a deep container (mint roots spread aggressively) and keep consistently moist. Mint tolerates partial shade, making it ideal for less sunny windowsills.

Coriander

Coriander bolts quickly in hot weather. Coco Coir's moisture retention helps keep roots cool. Sow directly into containers (coriander dislikes transplanting) and harvest leaves regularly to delay bolting.

Parsley

Parsley is slow to germinate (2–4 weeks) but thrives in coco coir. Keep the surface consistently moist during germination. Once established, parsley is robust and productive for months.

Chives

Extremely easy in coco coir. Sow seeds or divide existing clumps. Chives tolerate most conditions and will produce for years in a container.

Rosemary and Thyme

These Mediterranean herbs prefer drier conditions. Use the higher-perlite mix (60:30:10) and allow the top layer to dry between waterings. Ensure excellent drainage — standing water will cause root rot.

Indoor vs Outdoor Herb Growing

Indoor: use coco coir in pots on a sunny windowsill (south-facing is ideal). Ensure pots have drainage holes. Water when the top 2cm feels dry. Feed fortnightly with liquid fertiliser during the growing season.

Outdoor: coco coir works brilliantly in patio containers, raised herb beds, and hanging planters. Mulch the surface to reduce evaporation in summer.

Getting Started

A single 5kg coco coir brick expands to 75 litres — enough to fill 15–20 herb pots. For a dedicated herb garden or multiple containers, the 15kg 3-pack provides 225 litres and better value.

Coco Coir gives your herbs the perfect balance of moisture, drainage, and aeration. Add a quality fertiliser and some sunshine, and you will have fresh herbs to pick all season long.

Learn more: Why Buffered Coco Coir Matters