Elm trees are a popular choice for many homeowners and landscapers, with their stately stature and broad leaves. However, some people worry that elm trees are dangerous because they can host Dutch elm disease. This disease is caused by a fungus that attacks the tree's vascular system, preventing water and nutrients from reaching the leaves.
As a result, the leaves will eventually turn brown and drop off. While Dutch elm disease can be devastating to an individual tree, it is not a threat to human health. The fungus is only harmful to elm trees, and there is no evidence that it can be transmitted to other plants or animals. So while elm trees may not be ideal for a garden, there is no need to worry about them causing any harm.