CSM a calcified seaweed product - mineral and trace element nutrition for your grassland. Designed to complement Suregrow Fertiliser.


Availability: In stock

Make the most of your grazing.........

  • Contains over 70 minerals and trace elements
  • Contains calcified seaweed
  • Improves grass quality, soil structure and root development
  • Stimulates root development and strength giving a denser sward
  • Improves the mineral and trace element content which will contribute to horse health
  • Is a totally natural product
  • Helps to reduce soil acidity
  • No need to remove horses during application
  • Can be applied all year round
  • Available in 20kg bags

from £ 16.50

Find a stockist     View pricing

Quantity Bag Size Unit Price
1-9 20kg Bags £21.50 per bag
10-14 20kg Bags £20.50 per bag
15-20 20kg Bags £19.50 per bag
21-30 20kg Bags £18.50 per bag
31-49 20kg Bags £17.50 per bag
50+ 20kg Bags £16.50 per bag
View FAQs


RequirementApplication Rate
Spring/Early Summer 2 bags/acre (40kgs)
Late Summer/Autumn 2 bags/acre (40kgs)
Can also be applied throughout winter  2 bags/acre (40kgs)

Spread as evenly as possible. 

For further information visit our FAQ's page or email us on / call us on 01423 223045.

Fertiliser spreaders

If you're interested in purchasing a spreader to apply Suregrow Fertiliser or CSM we recommend the following brands.

'Logic' -

Logic Manufacturing Ltd has been producing top quality equipment for farming, gamekeeping and forestry for many years and since the early 90's has worked closely with the equestrian industry to provide a range of specialist products to help carry out essential tasks quickly and efficiently.

Logic has worked with Suregrow Fertiliser to flow rate and tray test the Suregrow products through their Electro-Broadcaster range, to provide a full set of calibration rates for all of the products. The Suregrow Fertiliser and CSM will comfortably spread and tray test accurately to 12m spread width from an Electro-Broadcaster mounted on an ATV. Logic already have calibration rates for grass seeds and wild flower meadow mix's so this simple cost effective spreader can cover the complete product range well.

The range includes mounted as well as ground driven models, all of which are easy to operate and can be fitted to or towed by any suitable vehicle.

Agri Fab -

Fleming -


Calcium 22% Sodium 12% Magnesium  4% 
CaO 21.5% Na2O 16% MgO 6.8%


What is CSM
CSM is a granular blend of Calcified Seaweed (from sustainable sources), Sun Dried Seasalt and a natural source of Magnesium. This gives a formulation which is high in Calcium, Sodium, Magnesium and Chloride and contains over 70 minerals and trace elements.

What are the benefits of using CSM
CSM provides a wide range of minerals and trace elements which maximise the utilisation of Nitrogen,
Phosphate, Potash and Sulphur. CSM encourages root development, improves the eating quality of grass and acts as a soil conditioner which results in a denser more vibrant turf.

Calcified Seaweed
During the 1980s and 1990s Calcified Seaweed was used extensively by grassland farmers and it transformed the nutrient status of the grass and soil. There are many testimonials that no single product has ever had such a beneficial effect on pasture growth and livestock health.

Calcified seaweed is a rich source of Calcium and Magnesium and contains over 70 minerals and trace elements. The Calcified Seaweed in CSM is in a granular form which maintains the inherent honeycombed structure. This is an ideal habitat for soil bacteria to colonise which in turn breaks down the Calcified Seaweed granules slowly releasing the minerals and trace elements.

Benefits of the minerals in CSM


  • Helps grass growth
  • Promotes and protects plant cell integrity
  • Neutralises plant cell acidity improving the palatability of the grass


  • Activates protein synthesis (grass growth)
  • Supports the absorption of Phosphate
  • Increased levels of Magnesium in the grass can have a calming effect on the horse
  • Reduces the Potassium imbalance in growing grass 
  • Improves the palatability of grass
  • Supports the transportation of nutrients in the plant
  • Improves enzyme activity
  • Assists photosynthesis (building up carbohydrate)

Trace Elements
Calcified Seaweed is rich in Iron, Manganese, Cobalt, Zinc, Iodine, Selenium, Molybdenum and these coupled with the other trace elements and major minerals in CSM combine to promote healthy, quality grass and improved soil structure. This overall is known as the ''Viets effect''

Spreading CSM
CSM is a similar density to a normal blend fertiliser and therefore the same spreader settings should be used.
Using CSM
We recommend the continuous use of CSM ideally twice per year in late Spring and again in early Autumn, this will ensure a continuous supply of minerals and trace elements.


  • Always store under cover in a cool dry place
  • Reseal bag after part use
  • Do not store in feed area
  • Can be spread by hand (wearing of gloves for sensitive skin is advisable)
  • Not recommended to be used by children
  • Do not feed to animals