Posidonia seagrass organic compost


 from sea plants(Posidonia oceanica) of the Greek sea                         

Posidonia seagrass organic compost@ derives from the biological fermentation of sea plant (Posidonia oceanica)  (using dead leaves, washed up on touristic  beaches) and selected products of agriculture (olive core, olive leaves, grape skin), without any chemical addition or process.


Α natural organic fertilizer and soil improver


Peat free

Use of restorable sources of energy


  • 80% Sea plant (Posidonia oceanica)

  • Grape skin

  • Olive leaves & olivecore

Benefits of Posidonia seagrass organic compost


A natural organic fertilizer and soil improver that offers 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

Quality A+

Earth smell

Typical information


Particle Size Distribution (sieve analysis) 

No larger than 20 mm screen

Bulk density               ~0.55 - 0.60 kg /lt     

Moisture content        25% - 30% m/m

Dry matter                   47%- 55% m/m

Organic matter           25%- 35% of the dry matter

Carbon:Nitrogen ratio   18- 25

pH                                   7 - 7.5

Electrical conductivity    0.50 - 2.50 mS/cm

Nutrients & Macrominerals


(N):                  0.80 - 1% 

(P2O5):           0.32 - 0.50%   
(K2O):             0.90 - 1%  
(CaO):                28 - 33%  
(MgO):                 2 - 3%


Copper (Cu)             > 15 ppm
Manganese (Mn)     > 450 ppm
Iron (Fe)                   > 3500 ppm
Zinc (Zn)                  > 70 ppm
Boron (B)                 > 650 ppm


* Due to the biological nature of POSIDONIA®

there is divergence in the values

Quality characteristics

Free of Heavy metals

(consequence in can be used in higher ratios per 1000 m2 )
All raw materials come from non- industrialized areas of Greece (Kefalonia island, Kyparissia bay and Marathon) with total absence of acid rain and air pollutions . 100% of the sea grass (species "Posidonia oceanica") origin shores have acquired a BLUE FLAG eco- label for beaches and marines



Long period treatment in order to reach full maturation
Numerus benefits for the plants:
a.  Non phototoxicity
b.  High concentration of humic and fulvic acids


Natural Soil improver


Natural  organic soil imrpover and organic compost withouth any chemicals. Derives from the biological fermentation of sea plant "Posidonia oceanica"  (using dead leaves, washed up on touristic  beaches) and selected products of agriculture (olive core, olive leaves, grape skin), without any chemical addition or process



The fact that the product comes from the open windrow composting process (aerobic fermentation) is demostrated by its dark brown color (instead of carbon- black color which is the result of burning), its characteristic texture and its natural earth odorPdonia@ derives from the biological fermentation of sea plant "Posidoa oceanica"  (using dead leaves, washed up on touristic  beaches) and selected products of agriculture (olive core, olive leaves, grape skin), without any chemical addition or process




Compost Hellas is  a representative of Greece at the European Compost Ntework



Certification by D.I.O. (National Organization for the Certification and Control of Organic Products). Procedures and raw materials utilized for the production of POSIDONIA® are in accordance with requirements and regulations of the E.U. (2092/91/appendix II/Part A) which refers to fertilizers and soil improvers that are allowed to use in organic farming.


 Ecological Product Award 

The Panhellenic Association of Environment Enterprises (PASEPPE) under the auspices of the Hellenic Federation of Enterprises (SEV) and with the support of the Union of Hellenic Chambers gave our company the 3rd AWARD FOR ECOLOGICAL PRODUCTS 2005-2006 within the framework of the candidacy for the competition of innovative products for the environmental protection in the European Union.


Greek Innovation

To produce natural fertilizers using sea grass Posidonia oceanic (using the dead leaves that are wash up in beaches), is a unique innovation in Greece and the president (Katerina Xenopoulou) of the company has received the related Greek patent no. 1003611 (OBI).

 Quality Approval

 Austrian Kompost - Entwicklung & Beratung ( Dipl-Ing Florian Amlinger- Technisches Büro für Landwirtschaft, UID ATU43789600,ECN EUROPEAN COMPOST NETWORK)


The product has been approved from the Austrian company as a product that its quality fills all the criteria as an A+ quality according to the Austrian, German and European direction.


Application rate

Application of POSIDONIA® during planting of young trees or plants and throughout their life-circle, offers a good store of organic matter and contributes to their well-balanced growth because its properties act accumulatively


Pot- plants & containers

•When planting new pots mix in an one POSIDONIA® to two or three soil ratio

•On already installed pots add POSIDONIA® as a top dressing (2-4 cm layer) two or three times a year



• When planting dig appropriately sized holes and mix in a one POSIDONIA® to two soil ratio


• On already installed trees use at least 20 lt (age up to 10 years) or  40lt (age at least 10 years) POSIDONIA® on the soil under tree’s foliage as mulch or work gently into the surface




  • When planting in a pot or jardinières (tomatoes / cucumbers / peppers)

Dig holes, add (2-3lt) Compost Hellas Posidonia® mix with  soil in a ratio of approximately one to one, stir well and plant


  • In beets: (lettuce / onion / celery / parsley / greens)

Spread 80 lt Compost Hellas Posidonia® in 10 m², scratch lightly on top to mix with soil and plant the new seedlings at a distance (10-15cm)(depending on cultivation) or sow the seeds


  • In existing plants:

We use   Compost Hellas Posidonia® surface,  around the stem of the plant (perimeter)


• When installing new vinery mix 2lt POSIDONIA® well with soil per plant

• On installed vineries use 8-12lt POSIDONIA® per vine as mulch


Seedlings and young plants:

Mix in a one POSIDONIA®, two soil, half perlite or pumice and one sand ratio. Keep blend slightly moist for 15-30 days and then sow or plant seedlings

Agricultural crops

Production of edible products:  

Every year we apply 1 big bag  of compost Posidonia® for each hectare, over the entire surface or in the  planting lines.


Production of non-food products:

Every three years, we apply 4 big bags of compost Posidonia® per hectare.


 Lawn laying:

Gently work POSIDONIA® into the surface (at least 100 lt per 50 m2) when preparing the ground


Scatter 4-8 handfuls of POSIDONIA® per m2 once or twice a year for maintenance

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

                                                Εμπλουτίζουν με Θρεπτικά &  Αναζωογονούν το Έδαφος