Fine Vermiculite – Ideal for Mushroom Cultivation & Seed Starting

Lightweight, sterile, and moisture-retentive — our premium vermiculite is perfect for mushroom growing, seed germination, and soil conditioning. A must-have for reliable humidity and even colonisation.

The Unsung Hero of Mushroom Growing

When it comes to healthy mycelium growth, humidity control is everything — and that’s where vermiculite shines.

At Kai Kai Farm, we supply high-quality, horticultural-grade vermiculite — the same substrate material we use in our own mushroom operations. Heat-expanded, lightweight, and completely inert, it supports your grow at every stage.

Tip: For best results, pair with our organic brown rice flour to create a balanced growing medium.

- Superior Moisture Retention: Holds up to 3–4× its weight in water, maintaining stable humidity around your substrate or casing layer.

- Sterile & Inert: Free from pathogens, heavy metals, and chemicals — safe for gourmet and medicinal mushroom cultivation.

- Perfect for PF Tek or Spawn Incubation: Commonly used to line jars, create humidity layers, or mix with brown rice flour for beginner-friendly grows.

- Multi-Purpose Use: Excellent for seed germination, propagation, and soil aeration in your garden.

- Reusable & Sustainable: 100% natural mineral expanded by heat — no additives, no waste.

🍄 How to Use in Mushroom Cultivation

- PF Tek Method: Mix with brown rice flour and water to create a nutritious, airy substrate.

- Humidity Layer: Use dry or damp vermiculite as a top layer in jars or tubs to buffer moisture and prevent contamination.

- Casing Material: Blend with peat moss or coco coir for consistent surface moisture during fruiting.

Form: Expanded horticultural vermiculite flakes

Origin: Sourced and packaged in Australia

Packaging: 7 L, 14 L, or 28 L resealable bags

Storage: Keep dry and sealed between uses

• We ship from Tamborine Mountain, QLD using either AusPost or Aramex
• Fast dispatch within 1 business day (excluding Fridays) with express post options available