The fact that peat-based growing media may occasionally have molds and odors caused by the microbial populations, should not be considered a problem, because it will not negatively impact the plants. When a product arrives with these molds, it’s recommended to expose the growing medium to fresh air and loosen the compressed medium. This will inhibit the microbial development by drying it out and oxygen will shut down microorganisms that create the odors. If there is some odor, it will dissipate over time.
Mold on peat moss is usually created by the growth of filamentous fungi. If the water content is high, these organisms will grow on almost any type of organic matter. While the sight of mold growing on a freshly opened substrate bale may seem worrisome, they are not pathogenic to plants. There are numerous species of fungi, and those found in peat moss are mostly saprophytes, meaning that they only feed on decomposing organic matter. Some of these microorganisms can even have beneficial effects on plant growth.
The Benefits of Microorganisms in Sphagnum Peat Moss
Sphagnum peat moss contains numerous microorganisms that occur naturally in peat bogs, including the bacteria Bacillus, the actinobacteria Streptomyces, the fungi Penicillium, Trichoderma and Mucor, to name a few. The presence of a healthy community of microorganisms in sphagnum peat moss makes it more difficult for root rot organisms like Fusarium to establish, because the inoffensive saprophytes compete with the pathogens for available resources. Moreover, some species such as Trichoderma and Streptomyces are known to synthetize molecules that are quite effective at suppressing some root rot pathogens though various modes of action. The microorganism population in peat varies depending on several factors, including the harvesting site. Blond, high quality and less decomposed peat typically has a more diverse and healthy population. It is therefore more susceptible to provide disease suppression. However, if the harvested peat isn’t stored properly, these suppressive properties will be lost.
The mold that can be seen on this picture is caused by saprophyte fungi, microscopic organisms found in peat bogs that are not pathogenic to plants. They mainly develop on the external layer of peat or growing media, underneath the plastic bag or wrapping, where water tends to accumulate during prolonged storage periods.
Causes
In unused peat-based growing media that have been stored for a prolonged period, some mold may be seen on the external layer of the mix, just beneath the plastic bag or wrapping. Water can build up in this area of the bale, which generates optimal conditions for fungus development. Mixes with high fertilizer charges or those that are exposed to high temperatures during storage are more at risk to develop mold, but it can occur on almost any peat-based product.
Recommendations
If you receive a product that has visible mold growing on its surface when you remove the plastic bag or wrapping, do not be alarmed. The product is perfectly safe to use and plant growth will not be affected by these microorganisms. The material can be managed like any other product you have received in the past:
•  loosen the substrate;
•  add the recommended water to optimize the characteristics of the mix before potting.
However, it is important to note that if a substrate is kept excessively wet during the crop cycle, populations of these microorganisms can grow considerably on the surface of the growing media in the pots. This may interfere with water distribution and penetration in the mix. To prevent this, we recommend following good irrigation practices; avoid overwatering the growing media and allow it to dry down to a certain extent before applying more water.

We offer wide range of packaging starting from 5l up to 6000l big bales and also materials in bulk are available.

We ship worldwide with 40′ containers.

Our main business is local raw material (peat moss, sand, pine bark, mulch, compost) sales but we purchase also coco peat, salt and offer to our customers

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