Is medium vermiculite suitable for covering seeds?
Yes. Sinclair identifies the medium grade for seed covering. Match the covering depth to the seed species.
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Sinclair Vermiculite Medium 100L — Medium-grade expanded vermiculite for professional seed covering, propagation and growing-medium blending.
Selected for professional horticulture, nursery production and garden or landscape applications where the product suits the crop and growing conditions.
Key benefits
How medium vermiculite works
Expanded vermiculite is a lightweight mineral with a layered structure and cation-exchange properties. In an appropriate growing-medium blend it helps buffer moisture and retain soluble nutrients, while the medium grade provides additional structure.
Seed covering and propagation
Apply an appropriate light covering over sown seed where the crop requires it. Maintain even moisture and follow the species-specific sowing depth and germination conditions; do not bury light-germinating seed unnecessarily.
Blending into growing media
Choose the inclusion rate for the crop and substrate. Vermiculite holds water, so consider the effect on the finished mix rather than assuming it will always improve drainage.
Sinclair Vermiculite Medium 100L product details
| Grade | Medium |
|---|---|
| Particle size | 2–5mm |
| Water holding (manufacturer figure) | 381ml per litre |
| Bag size | 100L |
| Manufacturer product reference | FXS1730S |
Sinclair Vermiculite Medium 100L FAQs
Is medium vermiculite suitable for covering seeds?
Yes. Sinclair identifies the medium grade for seed covering. Match the covering depth to the seed species. What is the particle size?
The manufacturer specifies 2–5mm. Does vermiculite hold nutrients?
Yes. Its layered mineral structure provides cation-exchange capacity, helping retain some soluble nutrients in a growing medium. Is it the same as perlite?
No. Vermiculite generally contributes more moisture and nutrient retention, while perlite is commonly selected primarily to increase air space. How much is supplied?
One 100L bag.
Sinclair Vermiculite Fine 100L — Fine-grade expanded vermiculite for seed sowing, propagation and growing-media moisture management.
Selected for professional horticulture, nursery production and garden or landscape applications where the product suits the crop and growing conditions.
Key benefits
Fine-grade vermiculite for propagation
The fine 1–3mm grade is suitable for fine seed-covering work and incorporation into appropriately designed propagation media. Its layered structure helps manage water and soluble nutrients around developing roots.
Using as a seed covering
Use a light, even covering where suitable for the crop. Follow seed-specific sowing depth and light requirements, and maintain moisture without saturating the propagation medium.
Choosing fine or medium
Fine vermiculite is smaller in particle size and has a higher manufacturer-stated water-holding figure than the medium grade. Choose by seed size, substrate texture and desired water management.
Sinclair Vermiculite Fine 100L product details
| Grade | Fine |
|---|---|
| Particle size | 1–3mm |
| Water holding (manufacturer figure) | 419ml per litre |
| Bag size | 100L |
| Manufacturer product reference | FXS1702S |
Sinclair Vermiculite Fine 100L FAQs
What is the difference between fine and medium vermiculite?
Fine is 1–3mm with a stated water holding of 419ml per litre; medium is 2–5mm with 381ml per litre. Can fine vermiculite be used for seed covering?
Yes, where the crop benefits from a light covering. Check whether the seed needs light for germination. Does it replace fertiliser?
No. Vermiculite can retain some dissolved nutrients but is not a complete fertiliser. Can it be mixed with propagation compost?
Yes. Choose the proportion according to the physical requirements of the crop and finished substrate. How much is supplied?
One 100L bag.
The Vermiculite collection offers a specialist range of horticultural vermiculite products designed to enhance growing media performance in commercial nursery, propagation and landscaping environments. Vermiculite is a lightweight, expanded mineral amendment valued for its ability to improve moisture retention, aeration and root zone stability - key components in healthy plant establishment. When blended into propagation mixes, seed-starting media, potting substrates or soil blends, vermiculite helps maintain consistent moisture levels without waterlogging, encourages uniform germination and supports vigorous root development. This makes it an indispensable material for professional growers, nurseries and landscapers who demand reliable, predictable results across a wide variety of plant types and production systems.
Supplied through garden wholesalers and horticultural distributors, this vermiculite range is tailored to meet the needs of trade customers operating high-volume production workflows. Whether used in propagation trays, potting benches, plugged trays or large-container mixes, vermiculite’s unique physical properties help reduce transplant shock, balance moisture dynamics and improve structural integrity of the growing medium. Including vermiculite in your garden supplies and growing media categories ensures that nurseries, growers and landscapers can access a proven amendment that elevates crop quality, enhances operational consistency and integrates seamlessly with other professional growing media products such as coco coir, perlite and peat-free blends.
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