Mould can occur when storing organic compost. This has nothing to do with the compost’s quality however, and this type of mould is not a health hazard. Mould spores can be found everywhere in the air. Under the right conditions (humidity and warmth), mould can form on any organic soil. During transportation and storage, there can be fluctuations in temperature, causing condensation in the bag. This promotes the germination of the mould spores.
If you find mould in your soil bag, we advise you to temporarily store it in a place that is drier and well ventilated to prevent the mould from spreading further. If you find the mould on the soil of a potted plant, remove the top layer (2 to 3cm) and dispose of it on your compost heap or in your garden waste bin.