Plants, meals and presents are all indispensable. Traditional foods and gifts vary widely among different individuals and their cultures, but we have a few essential plants.
The Christmas tree is possibly the most obvious example. Would it really be a holiday if there were no Christmas trees?
When December rolls around, homes around the country must often be reorganized in order to accommodate a tree, whether it is to be fir or spruce, fresh cut, potted, or even artificial.
Now most of the US and Europe follow the custom, although there are many explanations as to how it became so important.