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Sea grass composting

Our method:
Open Windrow Composting

The open windrow composting process commences with sea grass mainly of the sea plant (Posidonia oceanica) and selected products of agriculture and stockbreeding (olive waste, manure, grapes skin) mixed and placed into windrows.

The compost produced can be applied in a range of end uses, within gardens, on brownfield sites, landscaping and full scale agriculture.
The screening grade of the product  is between 0mm and 20mm particles which can then be used as natural soil  fertilizer and improver, mulch, topsoil constituent, turf dressing, and as an ingredient of growing medium. 

Our composting product:
What is compost

Organic matter in soil is essential for soil structure, water holding properties, microbial activity and soil health. Composts can be used to add organic matter to soils and increase the production of soils through many benefits:

  • reduction in soil compaction and improvement in soil water holding capacity.

•    better soil structure leading to greater workability of soil and increased traffic tolerance.
•    increased microbial activity and beneficial to soil.
•    improved root growth and reduced root diseases giving better plant survival and growth with improved plant quality.
•    reduced nutrient leaching and increased nutrient levels with a reduced need for costly fertilizers.
•    increased soil cation exchange capacity.
•    increased yielding potential.
•    plant disease suppression giving better plant survival and growth with improved plant quality.
•    reduced erosion risk with reduced capping.
•    microorganisms to aid soil aggregation and nutrient recycling.
•    increased soil temperatures.
•    reduction in plant deaths.

Composts are biologically active and contain a complex mix of microorganisms which have been shown to suppress a range of plant pathogen species including Pythium, Phytophthora, and Rhizoctonia, which cause a variety of symptoms including wilting, root rots and tissue necrosis. Using compost as a soil amendment may suppress these diseases and reduce plant losses.

Compost produced from sea grass  is a great way of putting organic matter and  nutrients fertilizing back into the soil.

Our  compost product is rich in organic matter and nutrients , with no chemical additives, and is locally produced in Greece.


We produce one grade of compost; our 15 mm grade is a  multipurpose compost used on gardens and lawns, is best used for new landscaping, vegetable growing, crop enhancement and site development; it is ideal for agricultural purposes


Offering the following benefits:

•    Improved structure & texture
•    Increased moisture retention
•    Improved aeration
•    Increased nutrient value
•    Improved fertility in tired or un-worked soils
•    Loosens clay soils
•    Stimulates healthy root development


  Posidonia oceanica
(an Environmental Protected sea plant)
Use of Posidonia's dried leaves  from Compost Hellas

Washed up leaves are collected with an environmental-friendly way (in order to protect the beach) from selected shores of Greece (Katelios in Kefalonia Island, Kyparisia bay and Marathon in Attica). The dead leaves of Posidonia oceanica make up 80% of the raw material used (through the open windrow composting process) for the production of POSIDONIA®.

Posidonia Oceanica Seagrass
(raw material of our compost)

Posidonia oceanica, named after the ruler of the sea, Poseidon, and commonly called Neptune grass, is a seagrass which plays an important role in the Mediterranean ecosystem.

120 million years ago Posidonia oceanica covered the coastal plains of an ocean that straddled the equator. Drifting over millennia with the tectonic plates, today Posidonia occurs only in the Mediterranean and around the southern coasts of Australia.


Posidonia oceanica lives in a narrow coastal strip, normally on beds of soft sediment, at depths of between 5 and 40 to 50 metres, depending on water clarity. It is a true plant, in that it can bear flowers and disperse seeds. However, flowering is quite rare with less than one flower found per 10 square metres per year.

It plays an important role in oxygenating and clarifying coastal waters, provides a habitat for a rich diversity of plants and animals, acts as a safe breeding area for many species, and protects beaches from erosion. Sea grasses also play a role in protecting our planet from the increasing build up of carbon dioxide. They act as a "carbon sink", like land-based plants, absorbing carbon dioxide from the atmosphere and thereby helping to slow down the effects of global warming.


Posidonia is a large, long-living but very slow-growing seagrass. Its shoots, which are able to live for at least 30 years, are produced at a slow rate from rhizomes which grow horizontally by only 1 to 6 centimetres each year. Over centuries the rhizomes form mats which rise up into reefs that help to trap sediment and mediate the motion of waves, thus clarifying the water and protecting beaches from erosion. Dead leaves are shed in the autumn and can be seen washed up on beaches.

                 Ιδανικά  Προϊόντα για την Βιολογική & Συμβατική Γεωργία, Κηπευτική & Ανθοκομική

                                                Εμπλουτίζουν με Θρεπτικά &  Αναζωογονούν το Έδαφος



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