I had always assumed that its just tradition that you buy flowers for somebody that is ill. Speaking as a woman who loves flowers, its always nice to receive flowers but I had underestimated their power.
Research completed by the American Society of Horticulture Science discovered that surgical patients exposed to flowers or plants in their recovery rooms have
lower blood pressure
lower heart rates
When compared to patients who whose rooms have no foliage, flowers or plants. In fact, patients who had plants in their room even reported more positive feelings and satisfaction about their rooms than those without plants.
So clearly there is a lot of wisdom in the tradition of buying flowers for people when they are ill.