Nowadays, in order to guard against theft, private villas generally have high walls, some of which are close to the house. Such a high fence, coupled with barbed wire, is like a cage, which not only makes people feel depressed, but also forms the accumulation of yin.
In this case, tall elms can be planted in the yard. Elm belongs to yang wood in trees, which has the effect of removing yin and generating yang, and can improve the situation of excessive yin.