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
5 products
5 products
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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
- 2–5mm particle size, as specified by Sinclair
- Manufacturer-stated water holding: 381ml per litre of vermiculite
- Layered mineral structure helps retain water and soluble nutrients
- Useful as a seed covering and to improve aeration in growing media
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
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
- 1–3mm particle size, as specified by Sinclair
- Manufacturer-stated water holding: 419ml per litre of vermiculite
- Fine structure suited to delicate seed-sowing work
- Layered mineral structure helps retain water and soluble nutrients
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.
Sinclair Growmore 25kg — Balanced granular general-purpose fertiliser for flowers, fruit, vegetables and other suitable garden and landscape crops.
Selected for professional horticulture, nursery production and garden or landscape applications where the product suits the crop and growing conditions.
Key benefits
- Verified NPK analysis: 7-7-7
- Equal declared proportions of nitrogen, phosphate and potash
- Suitable for base dressing or top dressing
- Manufacturer-stated particle size: 0.5–3mm
- 25kg bag for professional use
Balanced NPK nutrition
Growmore supplies nitrogen to support vegetative growth, phosphate for root and energy processes, and potash for water regulation and general plant function. Its equal NPK analysis makes it a flexible general-purpose feed, not a substitute for crop-specific nutrition planning.
Where to use Growmore
Sinclair identifies Growmore for most types of flowers and for fruit and vegetables. It can be used as a base dressing or top dressing where the current label and crop requirements permit.
Application and handling
Apply evenly at the rate stated on the current bag label for the crop and soil conditions. Avoid concentrated deposits against stems or roots, and wash any fertiliser granules off plant foliage as the manufacturer advises.
Sinclair Growmore 25kg product details
| Fertiliser type | Granular general-purpose fertiliser |
|---|---|
| NPK analysis | 7-7-7 |
| Particle size | 0.5–3mm |
| Bag size | 25kg |
| Pallet quantity | 39 bags |
| Manufacturer product reference | F1504473S |
Sinclair Growmore 25kg FAQs
What does NPK 7-7-7 mean?
The declared nitrogen, phosphate and potash figures are equal, making this a balanced general-purpose fertiliser. Can it be used on fruit and vegetables?
Yes. Sinclair identifies fruit and vegetables among its intended applications. Can Growmore be used before planting?
Yes. The manufacturer lists base dressing as an application; follow the current label for rate and incorporation guidance. Can it be used on established plants?
Yes. It is also suitable as a top dressing where appropriate for the crop. Should granules be left on leaves?
No. Sinclair advises washing fertiliser off foliage. How is it supplied?
One 25kg bag; 39 bags per full pallet.
Sinclair Fish, Blood & Bone 25kg — Organic-based general-purpose plant fertiliser for professional growing, planting and garden nutrition.
Selected for professional horticulture, nursery production and garden or landscape applications where the product suits the crop and growing conditions.
Key benefits
- Verified NPK analysis: 3-9-3
- Organic-based formulation
- Phosphate-rich analysis for root establishment and plant nutrition
- 25kg professional bag
Organic-based plant nutrition
Sinclair Fish, Blood & Bone provides nitrogen, phosphate and potash in an organic-based formulation. The relatively high phosphate analysis can be useful where soil testing and crop requirements indicate a need for phosphate.
Applications in planting and growing
The manufacturer positions this as a general-purpose feed. Consider it for suitable planting and maintenance programmes, taking account of existing soil fertility, crop requirements and any other fertilisers already applied.
Application and precautions
Follow the current bag label for the application rate and timing; these are not specified here. Spread evenly, avoid direct concentrated contact with foliage, and wash fertiliser from leaves as Sinclair advises. Store securely and follow the packaging precautions.
Sinclair Fish, Blood & Bone 25kg product details
| Fertiliser type | Organic-based general-purpose fertiliser |
|---|---|
| NPK analysis | 3-9-3 |
| Bag size | 25kg |
| Pallet quantity | 39 bags |
| Manufacturer product reference | F1504471S |
Sinclair Fish, Blood & Bone 25kg FAQs
What is the NPK analysis?
Sinclair specifies 3-9-3. Is Fish, Blood & Bone an organic-based fertiliser?
Yes. Sinclair describes it as an organic-based general-purpose plant food; this does not itself establish certification for every organic production scheme. What does the higher phosphate content contribute?
Phosphate is important for root development and energy transfer in plants. Actual benefit depends on the crop and existing soil nutrient levels. Is it a complete replacement for soil testing?
No. A soil or substrate test can help determine whether phosphate or other nutrients are needed. What application rate should I use?
Follow the current Sinclair pack instructions for the crop and planting conditions. How is it supplied?
One 25kg bag; 39 bags per full pallet.
Sinclair Bonemeal 25kg — Natural organic, slow-acting fertiliser with a phosphate-rich analysis for planting and establishment.
Selected for professional horticulture, nursery production and garden or landscape applications where the product suits the crop and growing conditions.
Key benefits
- Verified NPK analysis: 3-9-0
- Slow-acting organic fertiliser
- Phosphate-rich feed associated with root development
- Manufacturer recommends it for trees, shrubs and herbaceous plants
- 25kg professional bag
Bonemeal for root establishment
Sinclair Bonemeal is a slow-acting organic plant food with a 3-9-0 NPK analysis. Phosphate supports root development, while the product supplies some nitrogen and no declared potash in the NPK analysis.
Tree, shrub and herbaceous planting
Sinclair identifies bonemeal as suitable for planting trees, shrubs and herbaceous plants. Match use to soil fertility and the plant species; adding phosphorus is not always necessary where soil levels are already sufficient.
Application and precautions
Follow the current bag label for the rate, placement and timing. Avoid leaving concentrated fertiliser against plant tissues, wash fertiliser from foliage as advised by Sinclair, and store securely.
Sinclair Bonemeal 25kg product details
| Fertiliser type | Natural organic slow-acting fertiliser |
|---|---|
| NPK analysis | 3-9-0 |
| Bag size | 25kg |
| Pallet quantity | 39 bags |
| Manufacturer product reference | F1504472S |
Sinclair Bonemeal 25kg FAQs
What is the NPK analysis of Sinclair Bonemeal?
The manufacturer specifies 3-9-0. Why is bonemeal used when planting trees and shrubs?
It supplies phosphate, an important nutrient for root development. Use should reflect soil nutrient levels and planting requirements. Is bonemeal fast acting?
Sinclair describes it as a slow-acting organic fertiliser. Does it supply potash?
The declared NPK analysis is 3-9-0, so no potash is declared in the NPK figure. How much should I apply?
Use the current Sinclair pack instructions and consider soil testing before adding phosphate. How is it supplied?
One 25kg bag; 39 bags per full pallet.
The Sinclair collection is built around two core needs in commercial horticulture: propagation performance and reliable, cost-effective nutrition. For growers, nurseries and landscaper supply buyers, Sinclair Vermiculite is a proven mineral additive used to improve rooting and early plant establishment. Available in Fine (1–3mm) for seed sowing and delicate root systems, and Medium (2–5mm) for broader propagation and soil conditioning, Sinclair vermiculite supports balanced moisture retention and aeration, helping reduce losses and improve uniformity across trays, modules and potting mixes.
Alongside propagation substrates, this page also includes Sinclair’s professional-grade fertilisers in 25kg trade packs, ideal for garden wholesalers, horticultural distributors and high-throughput growing operations. Sinclair Growmore 25kg provides a balanced NPK 7-7-7 for general feeding across flowers, fruit, vegetables, trees and shrubs, while Sinclair Fish Blood & Bone 25kg (NPK 3-9-3) supports root development, flowering and fruiting using an organic-based formula. For planting and establishment, Sinclair Bonemeal 25kg (NPK 3-9-0) delivers slow-release phosphorus to encourage strong root systems—especially useful for trees, shrubs and herbaceous planting. It’s a highly relevant, margin-friendly range for professional buyers who want dependable inputs that slot neatly into existing crop programmes and garden supply catalogues.