You know the stuff used for bushes etc. Normally pre-packed and coloured and charged at an extortionate price for a small bag's worth. Well a friend has found (in the area he lives) a free sustainable source of Lichen. Question is though does it need any treatment to stop it going into decay or will it just dry out naturally. I've found one place that recommends boiling it in a mixture of glycerine and water is this all the treatment it needs or are there other processes that will give the same results?. Once again many thanks for any help you guys can give. Regards Roy.