There are many factors that can cause winter or Christmas mould in your home or business but one of the main ones is that moisture is present to help the mould to grow. Mould needs moisture, so if things like damp, condensation or even a water leak cause moisture to exist, it can help the mould to grow. Getting to the bottom of what is causing that moisture will often help you to understand the cause of the mould, how to stop it returning and also other issues associated with it.