Prasinophobia, coming from the Greek words "prasinos", meaning "green", and "phobos", meaning "fear", is the fear of the colour green. Often associated with the fear of vegetation, prasinophobia may arise from traumatic experiences involving plants, for instance poison ivy, weeds and vines. Alternatively, a negative experience involving the colour green may form the basis of the phobia.

People with prasinophobia is often treated with exposure therapy, involving patients to repeatedly look at the colour green under the guidance of a therapist until they no longer fear it. Exposure therapy always begins small, with a green dot for instance, and gradually working up to something much larger, such as a room with green walls. Other forms of behavioral therapies may also help to challenge the fear in a rational manner.

Green is not the only colour that people have grown to fear. Erythrophobia, for instance, is the fear of red, and cyanophobia is the fear of blue. People who fear the colour yellow suffer from xanthophobia, and those who fear the colour orange have chrysophobia. There are also names for the fear of purple (porphyrophobia), pink (rhodophobia), brown (kastanophobia), grey (glaucophobia), black (melanophobia) and white (leukophobia).

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