Vermiculite Medium Grade is a high-quality, lightweight mineral used to improve soil aeration, moisture retention, and root development in propagation and growing media. Sourced from naturally occurring mica, this exfoliated mineral expands when heated, forming soft, absorbent granules ideal for use in seed sowing, plug production, container planting, and soil conditioning.
This 100L bag of medium-grade vermiculite is particularly well-suited for gardeners, nurseries, landscapers, and professional horticulturalists who require a reliable soil additive to enhance propagation success and water management. It helps reduce soil compaction, retain essential moisture, and support uniform seed germination.
Features & Benefits
Improves soil structure – Enhances porosity and reduces compaction
Excellent moisture retention – Holds water and nutrients near the roots
Boosts germination and root growth – Perfect for seed starting and young plants
Inert and sterile – Free from pests, diseases, and weeds
Lightweight and easy to handle – Ideal for mixing with compost or potting media
pH neutral – Safe and stable across a wide range of plant types
Applications & Application Rates
Ideal for:
Seed sowing and germination
Plug plant production
Potting mixes and compost blends
Soil aeration and moisture regulation
Hydroponics and indoor growing
Tree and shrub planting mix improvements
Application Guidelines:
Seed sowing: Mix 25–50% vermiculite with seed compost, or apply a fine layer over seeds to aid moisture retention and germination
Potting mixes: Incorporate at 10–30% volume depending on desired porosity and water-holding needs
Soil amendment: Mix into heavy or compacted soils at 20–25% by volume for better drainage and structure
Formulation & How to Apply
Formulation: Medium-grade exfoliated vermiculite (naturally expanded mica)
Application: Mix thoroughly with compost, growing media, or soil before sowing or planting. Can be used on its own or in combination with perlite and peat-free composts.
Storage: Store in a dry, sheltered environment. Reseal after use to prevent moisture absorption.

Specification Details
Product Name Vermiculite Medium Grade
Grade Medium
Composition Exfoliated mica mineral
Function Soil aeration, moisture retention, propagation
Application Method Mix with compost or soil
Typical Uses Seed sowing, potting, soil amendment
pH Level Neutral
Bag Size 100 litres
Target Users Gardeners, nurseries, landscapers, horticulturists