Tref has a processing line for bark.

Bark is the name for non-composted bark as used in many potting soil mixtures.

Bark is a residual product from the wood production from the Pinus pinaster (the Maritime Pine).

 

There are two important wood production areas in Europe for this type of tree, that is, Les Landes in France near Bordeaux and from Northern Portugal to Lisbon.

 

The bark of this Maritime Pine is extremely suitable to produce the required fractions for many applications through a decomposition and screening process.

The bark of this tree also has the property of being very stable in potting soil mixtures. Bark has a lower moisture content than peat.

 

Potting soils can be produced with this bark that has a lower moisture content, which is important to, in particular, outdoor cultivations in pots and containers.

 

The bark is purchased by Tref as coarse material. Fractions 0, 1, and 2 are produced with our own decomposition and screening process.

Fractions 0 and 1 are used in potting soil mixtures. Fractions 1 and 2 are used for substrate mixtures for the culture of pot orchids.  

 

Tref produces the often used propagation bark based on this bark using a separate screening system, which can be used against weeds and the growth of liverwort on pots and container cultures in tree nurseries.

 

Bark fractions 1 and 2 for pot orchids must contain a low percentage of fibre (cambium) and white wood.

 

The quality of the bark for the decomposition and screening process is the determining factor for the quality standard as defined within the RHP standardisation at a 100 % application in a mix.