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Mould on cannabis is hardly a new issue; it is, in fact, something that cannabis growers have been battling since they started growing cannabis.

Mould growth can be attributed to moist growing conditions and humidity during the curing process, which is when the flower is dried and prepared for consumption. Properly curing cannabis can lead to higher potencies and better preserve terpene profiles, which can produce a more flavourful and aromatic experience.

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The number one factor contributing to development of mould is moisture control, says Jodi McDonald, president and founder of Keystone Labs.

“If the producer can control the mould in the process, there will be no mould in the product. They do that through moisture control and through process control,” McDonald explains. “Key parts of process control include: HVAC (heating, ventilation and air conditioning) design, personnel hygiene, clean-out procedures between batches and the flow of materials (in and out of grow rooms),” she adds.