Slippery elm trees have gummy lining in their bark that is used for a range of purposes for herbal medicine and because that is so, many people are stripping the trees of their bark. Unfortunately the trees cannot survive without their bark and they are falling to disease and exposure.
The soothing properties of the gummy lining of the bark is used for treating coughs, stomach aches and for skin irritations. The problem is that these home remedies are now being used by millions of consumers creating a marketplace in our national parks for botanicals and other homeopathic remedies but hurting much of the plant life to poaching.
The prime season for stripping the bark is mid-June and early-July. Thankfully the authorities are on the look-out for people stripping the elm trees. In addition, ginseng trees are also being hurt by people digging up their roots. But now amny of these trees are protected electronically with tracking devices that help police monitor the trees safety.
If you want to learn more about Botanicals and Herbal Medicine, try this great book - Encyclopedia of Herbal Medicine: The Definitive Home Reference Guide to 550 Key Herbs with all their Uses as Remedies for Common Ailments